US 12,145,937 B2
Process for preparing bicyclic guanidines
Elke Fritz-Langhals, Ottobrunn (DE); and Uwe Scheim, Coswig (DE)
Assigned to WACKER CHEMIE AG, Munich (DE)
Appl. No. 17/272,898
Filed by WACKER CHEMIE AG, Munich (DE)
PCT Filed Sep. 6, 2018, PCT No. PCT/EP2018/074069
§ 371(c)(1), (2) Date Mar. 2, 2021,
PCT Pub. No. WO2020/048604, PCT Pub. Date Mar. 12, 2020.
Prior Publication US 2021/0214367 A1, Jul. 15, 2021
Int. Cl. C07D 487/04 (2006.01)
CPC C07D 487/04 (2013.01) 13 Claims
 
1. A process for producing bicyclic guanidines, comprising reacting (A) dialkylenetriamine with (B) dialkyl carbonate
in the presence of (C) silane of the formula
Si(ORx)oRy(4-o)  (IV)
and/or partial hydrolysates thereof,
where
Rx are identical or different and are monovalent hydrocarbon radicals having 2 to 10 carbon atoms,
Ry are identical or different and are monovalent hydrocarbon radicals having 1 to 30 carbon atoms in which individual CH2 moieties not bonded to silicon are optionally replaced by oxygen or substituted by silyl group(s) and
is 1, 2, 3 or 4,
with the proviso that, in the case of silanes of the formula (IV) where o=4, at least two radicals Rx represent a monovalent, optionally substituted hydrocarbon radical having 3 to 10 carbon atoms.