Manufacture of a wittig ester salt

Manufacture of a wittig ester salt

  • CN 1,080,266 C
  • Filed: 03/21/1995
  • Issued: 03/06/2002
  • Est. Priority Date: 03/23/1994
  • Status: Active Grant
First Claim
Patent Images

1. the chlorination of general formula I (3-alcoxyl alkyl carbonyl-crotyl) triphenyl phosphonium or C 1-4The preparation method of alkylsurfuric acid (3-carbalkoxy-crotyl) triphenyl phosphonium X -(C 6H 5) 3P

  • CH 2CH=

    C(CH 3)COOR I Wherein R is meant C 1-4Alkyl, X-are meant chlorion or C 1-4Alkyl sulfate ion, this method comprise the 2-methyl-3-crotononitrile α

    -chlorination that makes formula II by basic metal or alkaline-earth metal hypochlorite CH 2=CHCH (CH 3) the 2-chloro-2-methyl-3-crotononitrile of CN II and the formula III that will so obtain CH 2=CHC (Cl) (CH 3) CN III or at first use the alcoholysis of alkane alcohol roh, wherein R is meant C 1-4Alkyl obtains 2-chloro-2-methyl-3-butenoic acid alkyl ester of corresponding following general formula I V CH 2=CHC (Cl) (CH 3) COOR IV is then with the reaction of itself and triphenyl phosphine, obtain required following general formula I '"'"' chlorination (3-carbalkoxy-crotyl) triphenyl phosphonium Cl -(C 6H 5) 3P +CH 2CH=C (CH 3) COOR I '"'"';

    Or, obtain chlorination (3-cyano group-crotyl) triphenyl phosphonium of formula V at first with formula III compound and triphenyl phosphine reaction Cl -(C 6H 5) 3P +CH 2CH=C (CH 3) CN V then with its in the presence of the vitriol oil with the alcoholysis of alkane alcohol roh, obtain required following general formula I " C 1-4Alkylsurfuric acid (3-carbalkoxy-crotyl) triphenyl phosphonium ROSO 2O -(C 6H 5) 3P

    CH 2CH=

    C(CH 3)COOR I″



View all claims
    ×
    ×

    Thank you for your feedback

    ×
    ×