JPS5817459B

1460057 Preparation of carbamates CHINOIN GYOGYSZER ES VEGYESZETI TERMEKEK GYARA RT 23 April 1974 [24 April 1973] 17748/74 Heading C2C Carbamates of the general formula in which R1 and R2 are identical or different and each represents a hydrogen atom or an alkyl group of 1-4 C atoms, R represents a halogen atom, aldehyde group or a grouping of the formula in ortho or meta-relation to the carbamoyloxy group, wherein X1 and X2 are identical or different and each represents oxygen or sulphur, and R3 and R4 are identical or different and each represents alkyl, alkenyl or alkynyl group or R3 and R4 are joined such that the whole residue R forms a 5-membered saturated or unsaturated heterocycle which contains X1 and X2 as heteroatoms) which comprises reacting a compound of the general formula in the presence of a base with a compound of the general formula in which A represents a phenyl group substituted with 2 or more electron withdrawing groups preferably a pentachlorophenyl group. Preferably the compound of the general Formula II is 2-(1,3-dioxolan-2-yl) phenol in which R1 is methyl and R2 is hydrogen. The compounds have insecticidal and accaricidal properties.