CN106478720B - 一种有机小分子催化剂及其制备方法 - Google Patents
一种有机小分子催化剂及其制备方法 Download PDFInfo
- Publication number
- CN106478720B CN106478720B CN201610879283.0A CN201610879283A CN106478720B CN 106478720 B CN106478720 B CN 106478720B CN 201610879283 A CN201610879283 A CN 201610879283A CN 106478720 B CN106478720 B CN 106478720B
- Authority
- CN
- China
- Prior art keywords
- bicyclic
- dimethyl
- dihydro
- isopropyl
- organic micromolecule
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000003054 catalyst Substances 0.000 title claims abstract description 24
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- 125000002619 bicyclic group Chemical group 0.000 claims abstract description 20
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Natural products N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 19
- 235000013832 Valeriana officinalis Nutrition 0.000 claims abstract description 12
- 244000126014 Valeriana officinalis Species 0.000 claims abstract description 12
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 12
- 235000016788 valerian Nutrition 0.000 claims abstract description 12
- -1 ammonia alcohols Chemical class 0.000 claims abstract description 11
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 claims abstract description 9
- LEVONNIFUFSRKZ-UHFFFAOYSA-N 3-(carboxymethyl)-2,2-dimethylcyclobutane-1-carboxylic acid Chemical compound CC1(C)C(CC(O)=O)CC1C(O)=O LEVONNIFUFSRKZ-UHFFFAOYSA-N 0.000 claims abstract description 7
- 125000000468 ketone group Chemical group 0.000 claims abstract description 7
- XGRJZXREYAXTGV-UHFFFAOYSA-N chlorodiphenylphosphine Chemical compound C=1C=CC=CC=1P(Cl)C1=CC=CC=C1 XGRJZXREYAXTGV-UHFFFAOYSA-N 0.000 claims abstract description 5
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 claims abstract description 3
- 238000006243 chemical reaction Methods 0.000 claims description 23
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 claims description 19
- 239000002585 base Substances 0.000 claims description 19
- FPIBKDDEZCKPGT-UHFFFAOYSA-N 4-propan-2-yl-4,5-dihydro-1,3-oxazole Chemical compound CC(C)C1COC=N1 FPIBKDDEZCKPGT-UHFFFAOYSA-N 0.000 claims description 13
- FYSNRJHAOHDILO-UHFFFAOYSA-N thionyl chloride Chemical compound ClS(Cl)=O FYSNRJHAOHDILO-UHFFFAOYSA-N 0.000 claims description 10
- 230000000694 effects Effects 0.000 claims description 9
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 7
- 239000003513 alkali Substances 0.000 claims description 6
- 229930006728 pinane Natural products 0.000 claims description 4
- XOKSLPVRUOBDEW-UHFFFAOYSA-N pinane of uncertain configuration Natural products CC1CCC2C(C)(C)C1C2 XOKSLPVRUOBDEW-UHFFFAOYSA-N 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 3
- 239000011230 binding agent Substances 0.000 claims description 3
- 239000012280 lithium aluminium hydride Substances 0.000 claims description 3
- QARBMVPHQWIHKH-UHFFFAOYSA-N methanesulfonyl chloride Chemical compound CS(Cl)(=O)=O QARBMVPHQWIHKH-UHFFFAOYSA-N 0.000 claims description 3
- 239000012359 Methanesulfonyl chloride Substances 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims 1
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 claims 1
- 239000000460 chlorine Substances 0.000 claims 1
- 229910052801 chlorine Inorganic materials 0.000 claims 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 claims 1
- 238000006555 catalytic reaction Methods 0.000 abstract description 11
- 239000002994 raw material Substances 0.000 abstract description 7
- IMSODMZESSGVBE-UHFFFAOYSA-N 2-Oxazoline Chemical compound C1CN=CO1 IMSODMZESSGVBE-UHFFFAOYSA-N 0.000 abstract description 6
- 239000003446 ligand Substances 0.000 abstract description 6
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 4
- 239000011574 phosphorus Substances 0.000 abstract description 4
- 238000001212 derivatisation Methods 0.000 abstract description 3
- 241000894007 species Species 0.000 abstract description 3
- 238000009833 condensation Methods 0.000 abstract description 2
- 230000005494 condensation Effects 0.000 abstract description 2
- 239000002243 precursor Substances 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract 1
- 125000003187 heptyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 abstract 1
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 21
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 18
- 239000000047 product Substances 0.000 description 15
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 9
- HSJKGGMUJITCBW-UHFFFAOYSA-N 3-hydroxybutanal Chemical compound CC(O)CC=O HSJKGGMUJITCBW-UHFFFAOYSA-N 0.000 description 8
- 235000019439 ethyl acetate Nutrition 0.000 description 8
- 238000000425 proton nuclear magnetic resonance spectrum Methods 0.000 description 8
- 238000003786 synthesis reaction Methods 0.000 description 7
- YMWUJEATGCHHMB-UHFFFAOYSA-N methylene chloride Substances ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 6
- 239000000758 substrate Substances 0.000 description 6
- DSSYKIVIOFKYAU-XCBNKYQSSA-N (R)-camphor Chemical compound C1C[C@@]2(C)C(=O)C[C@@H]1C2(C)C DSSYKIVIOFKYAU-XCBNKYQSSA-N 0.000 description 5
- 125000003504 2-oxazolinyl group Chemical group O1C(=NCC1)* 0.000 description 5
- 238000005575 aldol reaction Methods 0.000 description 5
- 230000003197 catalytic effect Effects 0.000 description 5
- 239000012043 crude product Substances 0.000 description 5
- 239000003480 eluent Substances 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- IKHGUXGNUITLKF-UHFFFAOYSA-N Acetaldehyde Chemical compound CC=O IKHGUXGNUITLKF-UHFFFAOYSA-N 0.000 description 4
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 4
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 description 4
- 238000004440 column chromatography Methods 0.000 description 4
- 239000003960 organic solvent Substances 0.000 description 4
- 241000723346 Cinnamomum camphora Species 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 229930008380 camphor Natural products 0.000 description 3
- 229960000846 camphor Drugs 0.000 description 3
- 239000007795 chemical reaction product Substances 0.000 description 3
- 238000003810 ethyl acetate extraction Methods 0.000 description 3
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 3
- CSNNHWWHGAXBCP-UHFFFAOYSA-L magnesium sulphate Substances [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 3
- 239000012266 salt solution Substances 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- UJHSIDUUJPTLDY-UHFFFAOYSA-N (2-nitrophenyl)-phenylmethanone Chemical class [O-][N+](=O)C1=CC=CC=C1C(=O)C1=CC=CC=C1 UJHSIDUUJPTLDY-UHFFFAOYSA-N 0.000 description 2
- BXRFQSNOROATLV-UHFFFAOYSA-N 4-nitrobenzaldehyde Chemical class [O-][N+](=O)C1=CC=C(C=O)C=C1 BXRFQSNOROATLV-UHFFFAOYSA-N 0.000 description 2
- 239000005711 Benzoic acid Substances 0.000 description 2
- JGFZNNIVVJXRND-UHFFFAOYSA-N N,N-Diisopropylethylamine (DIPEA) Chemical compound CCN(C(C)C)C(C)C JGFZNNIVVJXRND-UHFFFAOYSA-N 0.000 description 2
- SMWDFEZZVXVKRB-UHFFFAOYSA-N Quinoline Chemical compound N1=CC=CC2=CC=CC=C21 SMWDFEZZVXVKRB-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 150000003934 aromatic aldehydes Chemical class 0.000 description 2
- 150000003851 azoles Chemical class 0.000 description 2
- 235000010233 benzoic acid Nutrition 0.000 description 2
- 239000000706 filtrate Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 150000002466 imines Chemical class 0.000 description 2
- 230000009257 reactivity Effects 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- MJCJFUJXVGIUOD-UHFFFAOYSA-N 2,3-dimethylbutane-1,2,3-tricarboxylic acid Chemical compound OC(=O)C(C)(C)C(C)(C(O)=O)CC(O)=O MJCJFUJXVGIUOD-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910010082 LiAlH Inorganic materials 0.000 description 1
- 229910010084 LiAlH4 Inorganic materials 0.000 description 1
- ZCQWOFVYLHDMMC-UHFFFAOYSA-N Oxazole Chemical compound C1=COC=N1 ZCQWOFVYLHDMMC-UHFFFAOYSA-N 0.000 description 1
- 229910006124 SOCl2 Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- AFCIMSXHQSIHQW-UHFFFAOYSA-N [O].[P] Chemical compound [O].[P] AFCIMSXHQSIHQW-UHFFFAOYSA-N 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 150000001299 aldehydes Chemical class 0.000 description 1
- 150000001335 aliphatic alkanes Chemical class 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- 125000000746 allylic group Chemical group 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000010290 biphenyl Nutrition 0.000 description 1
- 239000004305 biphenyl Substances 0.000 description 1
- 239000007809 chemical reaction catalyst Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- MFIGJRRHGZYPDD-UHFFFAOYSA-N n,n'-di(propan-2-yl)ethane-1,2-diamine Chemical compound CC(C)NCCNC(C)C MFIGJRRHGZYPDD-UHFFFAOYSA-N 0.000 description 1
- 229930014626 natural product Natural products 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 238000005935 nucleophilic addition reaction Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000006053 organic reaction Methods 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- ZUOUZKKEUPVFJK-UHFFFAOYSA-N phenylbenzene Natural products C1=CC=CC=C1C1=CC=CC=C1 ZUOUZKKEUPVFJK-UHFFFAOYSA-N 0.000 description 1
- 125000004437 phosphorous atom Chemical group 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 150000003384 small molecules Chemical class 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F9/00—Compounds containing elements of Groups 5 or 15 of the Periodic Table
- C07F9/02—Phosphorus compounds
- C07F9/547—Heterocyclic compounds, e.g. containing phosphorus as a ring hetero atom
- C07F9/6527—Heterocyclic compounds, e.g. containing phosphorus as a ring hetero atom having nitrogen and oxygen atoms as the only ring hetero atoms
- C07F9/653—Five-membered rings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
- B01J31/02—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides
- B01J31/0234—Nitrogen-, phosphorus-, arsenic- or antimony-containing compounds
- B01J31/0255—Phosphorus containing compounds
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C201/00—Preparation of esters of nitric or nitrous acid or of compounds containing nitro or nitroso groups bound to a carbon skeleton
- C07C201/06—Preparation of nitro compounds
- C07C201/12—Preparation of nitro compounds by reactions not involving the formation of nitro groups
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Heterocyclic Carbon Compounds Containing A Hetero Ring Having Nitrogen And Oxygen As The Only Ring Hetero Atoms (AREA)
Abstract
Description
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201610879283.0A CN106478720B (zh) | 2016-10-08 | 2016-10-08 | 一种有机小分子催化剂及其制备方法 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201610879283.0A CN106478720B (zh) | 2016-10-08 | 2016-10-08 | 一种有机小分子催化剂及其制备方法 |
Publications (2)
Publication Number | Publication Date |
---|---|
CN106478720A CN106478720A (zh) | 2017-03-08 |
CN106478720B true CN106478720B (zh) | 2018-03-30 |
Family
ID=58268624
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN201610879283.0A Active CN106478720B (zh) | 2016-10-08 | 2016-10-08 | 一种有机小分子催化剂及其制备方法 |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN106478720B (zh) |
-
2016
- 2016-10-08 CN CN201610879283.0A patent/CN106478720B/zh active Active
Also Published As
Publication number | Publication date |
---|---|
CN106478720A (zh) | 2017-03-08 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN103087105B (zh) | 手性膦配体以及包含该配体的金属催化剂和它们的应用 | |
CN101597286B (zh) | 一种含有伯胺、叔胺和脲或硫脲的有机催化剂及其制备 | |
CN104804006A (zh) | 一种合成手性Tr*ger′s base衍生物的方法 | |
EP3896053A1 (en) | Method for directly constructing tetra-substituted allenic acid compound having high optical activity | |
CN111925356B (zh) | 手性喹啉-咪唑啉配体的合成方法及其应用 | |
JP5482200B2 (ja) | ホスホロアミド化合物、及び光学活性アルコールの製造方法 | |
CN106478720B (zh) | 一种有机小分子催化剂及其制备方法 | |
CN106925351A (zh) | 含有咪唑盐离子液体基团的n‑杂环卡宾钌催化剂及其制备方法 | |
CN105669746A (zh) | 一种二芳基磷酸酯类化合物的合成方法 | |
CN103272638B (zh) | 基于酒石酸骨架的手性胍催化剂及其制备方法和应用 | |
CN106478721B (zh) | 一种樟脑衍生的恶唑啉‑氧磷有机小分子催化剂及其制备方法 | |
CN109942418A (zh) | 化合物及手性化合物的制备方法 | |
KR20080111035A (ko) | 배위자 및 그의 제조 방법, 및 상기 배위자를 이용한 촉매 | |
CN107469858B (zh) | 一种季戊四醇固载的手性二胺衍生硫脲催化剂及其制备方法与应用 | |
CN104151332A (zh) | 基于双吡唑甲基苯氧甲基咪唑的氮杂环卡宾银配合物及其制备方法与应用 | |
CN102140071A (zh) | 2-(4-叔丁基苯基)-氰基乙酸(2-甲氧基)乙基酯的合成方法 | |
CN102936219B (zh) | 手性6,6'-二咔唑基联萘酚 | |
CN107325025B (zh) | 一种手性α-氨基酸衍生物及其制备方法 | |
CN106478719B (zh) | 一种手性催化剂及其制备方法 | |
CN103450073A (zh) | 具有环丙烷结构r-二苯基脯氨醇类手性有机小分子化合物及其合成方法 | |
CN104059009A (zh) | 一种依折麦布重要中间体的合成方法 | |
CN115340475B (zh) | 一种1-氧化二苯基二氮烯或其衍生物的制备方法 | |
CN102093420B (zh) | 手性大环胺膦配体及其制备方法和应用 | |
CN1093539C (zh) | 一种合成β一卤代丁烯酸内酯的方法 | |
CN101835745A (zh) | 二磺酸化合物的制法、不对称曼尼希催化剂、β-氨基羰基衍生物的制法及新型二磺酸盐 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
C06 | Publication | ||
PB01 | Publication | ||
SE01 | Entry into force of request for substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
GR01 | Patent grant | ||
GR01 | Patent grant | ||
EE01 | Entry into force of recordation of patent licensing contract | ||
EE01 | Entry into force of recordation of patent licensing contract |
Application publication date: 20170308 Assignee: SHANGHAI GANTIAN OPTICAL MATERIALS Co.,Ltd. Assignor: SHANGHAI INSTITUTE OF TECHNOLOGY Contract record no.: X2024980004851 Denomination of invention: An organic small molecule catalyst and its preparation method Granted publication date: 20180330 License type: Common License Record date: 20240424 |
|
EE01 | Entry into force of recordation of patent licensing contract | ||
EE01 | Entry into force of recordation of patent licensing contract |
Application publication date: 20170308 Assignee: Shanghai Anpu Experimental Technology Co.,Ltd. Assignor: SHANGHAI INSTITUTE OF TECHNOLOGY Contract record no.: X2024980004979 Denomination of invention: An organic small molecule catalyst and its preparation method Granted publication date: 20180330 License type: Common License Record date: 20240428 |