IT1090360B - Piperonal prepn. - by reacting (1,2)-methylene-di:oxy-benzene with a (N)-alkyl-formanilide and a condensing agent
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Piperonal prepn. - by reacting (1,2)-methylene-di:oxy-benzene with a (N)-alkyl-formanilide and a condensing agent
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IT1090360B
IT1090360BIT3116077AIT3116077AIT1090360BIT 1090360 BIT1090360 BIT 1090360BIT 3116077 AIT3116077 AIT 3116077AIT 3116077 AIT3116077 AIT 3116077AIT 1090360 BIT1090360 BIT 1090360B
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Priority claimed from JP7310976Aexternal-prioritypatent/JPS52156867A/en
Application filed by Mitsui Toatsu ChemicalsfiledCriticalMitsui Toatsu Chemicals
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Prepn. of piperonal of formula (III) useful as flavour for deodorants or raw material for pharmaceuticals or agricultural chemicals comprises reacting 1,2-methylenedioxybenzene of formula (II) with an N-alkylformanilide of formula (I) and, as a condensing agent, P oxychloride, phosgene, etc. (R is 1-4C alkyl group) Piperonal can be obtd. at high yield and high selectivity. The by-produced monoalkylaniline (IV) can easily be recovered and is reacted with formic acid to prepare the N-alkylformanilide (I).
IT3116077A1976-06-231977-12-22Piperonal prepn. - by reacting (1,2)-methylene-di:oxy-benzene with a (N)-alkyl-formanilide and a condensing agent
IT1090360B
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