CN110903327A - 一种磁性五配位单核钴配合物及合成方法和应用 - Google Patents
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Abstract
本发明涉及一种磁性五配位单核钴配合物及合成方法和应用,它属于催化剂制备技术领域。本发明的目的是解决现有催化剂存在结构复杂、不易制备、催化剂活性不够高、用量大和反应时间长的技术问题。本发明采用的技术方案是,其合成步骤为:在惰性气体保护下,四甲基乙二胺的乙醚溶液经正丁基锂锂化后与环己酮加成,搅拌反应1‑2小时后在丙酮浴中缓慢加入无水氯化钴,恢复室温搅拌2‑4小时,反应完毕后真空浓缩滤液,析出紫色透明晶体,即为磁性五配位单核钴配合物。本发明合成的配合物采用“一锅法”制得,制备过程简单,原料易得,反应条件温和;其作为催化剂对醛、酮类化合物的MPV反应有较高选择性,能高效地合成相应的醇类化合物。
Description
技术领域
本发明涉及一种磁性五配位单核钴配合物及合成方法和应用,它属于催化剂制备技术领域。
背景技术
一级和二级醇的选择性合成是有机合成、制药和食物香料工业等领域的一个重要转化过程。Meerwein-Ponndorf-Verley(MPV)反应被认为是由醛、酮制备一级和二级醇的重要反应之一,该反应通常使用主族金属、过渡金属、镧系和锕系等金属化合物作为催化剂,主要是金属的醇盐,氧化物及其配合物等,而且催化剂存在结构复杂,不易制备,催化剂活性不够高,用量大,反应时间长等不足,因此,开发新的和有效的催化反应系统仍然是科研工作者努力的重点。其中钴的配合物在催化该类反应中被认为活性较低的一类,而本发明中合成的磁性五配位单核钴配合物在碱性氢氧化物存在时,用于催化MPV反应产率和活性较高,并有望成为具有廉价、高活性、可再生利用的新型催化剂,旨在为今后的工业应用开发新技术。
发明内容
本发明的目的是解决现有催化剂存在结构复杂、不易制备、催化剂活性不够高、用量大和反应时间长的技术问题,提供一种磁性五配位单核钴配合物及合成方法和应用。该配合物合成简便,反应条件温和,对选择性催化合成一级和二级醇具有较高的活性。
为解决上述技术问题,本发明采用的技术方案是:
一种磁性五配位单核钴配合物,该配合物的结构式为:
式中:钴原子与配体中的两个氧原子、两个氮原子和氯原子形成五配位结构,而且形成两个共用N-Co键的五元环,钴原子分别与两个配体中的氧原子以Co-O配位键形成二聚体构型的分子结构。
所述的一种磁性五配位单核钴配合物的合成方法,其合成步骤为:
在惰性气体保护下,四甲基乙二胺的乙醚溶液经正丁基锂锂化后与环己酮加成,搅拌反应1-2小时后在丙酮浴中缓慢加入无水氯化钴,恢复室温搅拌2-4小时,反应完毕后真空浓缩滤液,析出紫色透明晶体,即为磁性五配位单核钴配合物。反应式:
进一步地,合成步骤为:在惰性气体保护下,将29.20mL的正丁基锂2.5M正己烷溶液在0℃下缓慢滴入70mmol~75mmol四甲基乙二胺的乙醚溶液中反应2小时,再将70mmol~75mmol环己酮滴入上述反应液中继续反应2小时,在丙酮浴下缓慢加入70mmol~75mmol无水氯化钴,恢复室温搅拌4小时,反应完毕后真空浓缩滤液,析出紫色透明晶体,即为五配位单核钴催化剂。
所述配合物作为还原催化剂能在醛、酮化合物制备相应的一级、二级醇类化合物中应用。
本发明的有益效果是:
本发明合成的配合物采用“一锅法”制得,制备过程简单,原料易得,反应条件温和,高产率地合成磁性的五配位钴化合物,在碱性氢氧化物存在时,其作为催化剂对醛、酮类化合物的MPV反应有较高选择性,能高效地合成相应的醇类化合物,该催化反应时间短、效率高,有很好的工业应用前景。
附图说明
图1是本发明磁性五配位单核钴配合物的单晶X射线结构图。
具体实施方式
下面结合实施例对本发明作进一步的描述。
实施例1
本实施例中的一种磁性五配位单核钴配合物,该配合物的结构式为:
式中:钴原子与配体中的两个氧原子、两个氮原子和氯原子形成五配位结构,而且形成两个共用N-Co键的五元环,钴原子分别与两个配体中的氧原子以Co-O配位键形成二聚体构型的分子结构。
上述磁性五配位单核钴配合物的合成方法,其合成步骤为:在惰性气体保护下,将正丁基锂(29.20mL,2.5M,正己烷溶液)在0℃缓慢滴入四甲基乙二胺(TMEDA)(11.02g,73mmol)的乙醚溶液中反应2小时,再将环己酮(7.54mL,73mmol)滴入上述反应液中继续反应2小时,在丙酮浴下缓慢加入无水氯化钴(9.41g,73mmol),恢复室温搅拌4小时,反应完毕后真空浓缩滤液,析出紫色透明晶体,即为五配位单核钴催化剂,产率73%,熔点为142-145℃。
如图1所示,单晶晶体参数:化学式:C24H50Cl2Co2N4O2,单斜晶系(Monoclinic),空间群C2/c,晶胞参数 α=90.000°,β=116.5450(10)°,γ=90.000°,V=2927.1(3),Z=4。部分键长Co(1)-O(1)2927.1(3),Co(1)-O(1’)2.0304(9),Co(1)-N(1)2.3433(11),Co(1)-N(2)2.1229(11),Co(1)-Cl(1)2.3046(4),C(1)-O(1)1.4187(15),C(1)-C(7)1.5331(18),N(1)-C(7)1.4856(17);键角(°):O(1)-Co(1)-O(1’)79.03(4),O(1)-Co(1)-N(1)78.85(4),O(1)-Co(1)-N(2)114.05(4),O(1)-Co(1)-Cl(1)135.83(3),Co(1)-O(1)-Co(1’)100.87(4),C(1)-O(1)-Co(1)114.27(7),C(1)-O(1)-Co(1’)135.60(8),O(1)-C(1)-C(7)104.83(10)。
实施例2
本实施例中的配合物的结构式与实施例1中的相同。
其合成步骤为:在惰性气体保护下,将正丁基锂(29.20mL,2.5M,正己烷溶液)在0℃缓慢滴入四甲基乙二胺(TMEDA)(70mmol)的乙醚溶液中反应2小时,再将环己酮(70mmol)滴入上述反应液中继续反应2小时,在丙酮浴下缓慢加入无水氯化钴(70mmol),恢复室温搅拌4小时,反应完毕后真空浓缩滤液,析出紫色透明晶体,即为五配位单核钴催化剂,产率73%,熔点为142-145℃。
实施例3
本实施例中的配合物的结构式与实施例1中的相同。
其合成步骤为:在惰性气体保护下,将正丁基锂(29.20mL,2.5M,正己烷溶液)在0℃缓慢滴入四甲基乙二胺(TMEDA)(75mmol)的乙醚溶液中反应2小时,再将环己酮(75mmol)滴入上述反应液中继续反应2小时,在丙酮浴下缓慢加入无水氯化钴(75mmol),恢复室温搅拌4小时,反应完毕后真空浓缩滤液,析出紫色透明晶体,即为五配位单核钴催化剂,产率73%,熔点为142-145℃。
实施例4
上述实施例制备的配合物在催化苯乙酮还原为1-苯乙醇(MPV)中的应用:常温氮气保护下,将五配位单核钴催化剂(0.12g,0.2mmol)与3.0mL异丙醇依次加入到25毫升装有回流冷凝管的Schlenk瓶中,加入2mL KOH的异丙醇溶液(1.0M),搅拌并控制温度60℃回流30分钟进而使催化剂活化,然后在反应液中加入苯乙酮(0.48g,4.0mmol),待反应混合液继续回流反应4小时后,冷却,取少量反应产物用GC-MS联用仪监测,产率93%。
Claims (4)
2.根据权利要求1所述的一种磁性五配位单核钴配合物的合成方法,其特征在于,合成步骤为:
在惰性气体保护下,四甲基乙二胺的乙醚溶液经正丁基锂锂化后与环己酮加成,搅拌反应1-2小时后在丙酮浴中缓慢加入无水氯化钴,恢复室温搅拌2-4小时,反应完毕后真空浓缩滤液,析出紫色透明晶体,即为磁性五配位单核钴配合物。
3.根据权利要求2所述的一种磁性五配位单核钴配合物的合成方法,其特征在于,合成步骤为:在惰性气体保护下,将29.20mL的正丁基锂2.5M正己烷溶液在0℃下缓慢滴入70mmol~75mmol四甲基乙二胺的乙醚溶液中反应2小时,再将70mmol~75mmol环己酮滴入上述反应液中继续反应2小时,在丙酮浴下缓慢加入70mmol~75mmol无水氯化钴,恢复室温搅拌4小时,反应完毕后真空浓缩滤液,析出紫色透明晶体,即为五配位单核钴催化剂。
4.根据权利要求1所述的一种磁性五配位单核钴配合物的应用,其特征在于,所述配合物作为还原催化剂能在醛、酮化合物制备相应的一级、二级醇类化合物中应用。
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CN102250137A (zh) * | 2011-05-23 | 2011-11-23 | 重庆大学 | 3,5-二叔丁基水杨醛缩乙二胺钛配合物及其制备方法和应用 |
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