公开(公告)号：US3248411A

公开(公告)日：1966-04-26

申请号：US18209562

申请日：1962-03-23

Applicant: STUDIENGESELLSCHAFT KOHLE MBH

Inventor： PAUL NEUMANN WILHELM ,  GOTTFRIED BURKHARDT

IPC: C07F7/22

CPC classification number: C07F7/22 ,  C07F7/2208 ,  C07F7/2216

Abstract: Alkyl tin trihalides may be made by reacting a tetra-alkyl tin with tin tetra-chloride, -bromide or -iodide in the molar ratio 1:2. The reaction takes place in two stages which may be carried out independently: SnR4=SnX4--->RSnX3+R3SnX R3SnX=SnX4--->RSnX3+R2SnX2 Using short, unbranched chain alkyl groups the reaction may be initiated at between 0 DEG and 20 DEG C. and is faster than when using longer or branched chain alkyl groups, which require initiation at elevated temperatures. The process is preferably carried out by adding the tetraalkyl tin dropwise to the tin tetrahalide, thus ensuring an excess of the latter throughout the reaction. If desired, the tin tetrahalide may be used as a complex, e.g. with an ether. The product, which contains RSnX3 and R2SnX2 may be separated into its constituents by distillation. The process may be modified using a trialkyltin halide in place of the tetraalkyl tin.