| 摘要 |
The invention provides a process for preparing a carbamate which comprises contacting in the presence of a base a polyolefin-secondary-amine with a chloroformate compound of formula (IV), in which R<1> is hydrocarbyl or substituted hydrocarbyl group containing up to 20 carbon atoms, thereby producing a polyolefin-N-substituted-carbamate of formula (I) in which R is a polyolefin radical having an average molecular weight in the range from 500 to 9,900, R<1> is a hydrocarbyl or substituted hydrocarbyl group containing up to 20 carbon atoms, and A is derived from an N-substituted amino group in which the substituent is a hydrocarbyl or substituted hydrocarbyl group containing up to 20 carbon atoms, and removing hydrogen chloride formed in producing the carbamate of formula (I) as a salt. The process facilitates preparation of the carbamates of formula (I), which are known gasoline additives, in improved yield. |
