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Preparation of 3,7,11-trimethyldodeca-2,4,6,10-tetraen-1-yl-phosphon ium salt, used in synthesis of carotinoids e.g. lycopene, involves preparation of 3-phosphonium salt from vinylpseudoionol at low temperature and rearrangement by heating
Preparation of 3,7,11-trimethyldodeca-2,4,6,10-tetraen-1-yl-phosphon ium salt, used in synthesis of carotinoids e.g. lycopene, involves preparation of 3-phosphonium salt from vinylpseudoionol at low temperature and rearrangement by heating
Preparation of triaryl-3,7,11-trimethyldodeca-2,4,6,10-tetraen-1-yl-p hosphonium salts (I) comprises: (1) reacting 3,7,11-trimethyldodeca-1,4,6,10-tetraen-3-ol with triarylphosphane and a hydrohalic, sulfuric, sulfonic, phosphoric or 1-6C alkanoic acid at -20 to 40 [deg] C to give 3,7,11-trimethyldodeca-1,4,6,10-tetraen-3-yl-phosphonium salt (III); and (2) rearranging (III) at 40-100 [deg] C to form the primary salt (I). Preparation of triaryl-3,7,11-trimethyldodeca-2,4,6-10-tetraen-1-yl-p hosphonium salts of formula (I) comprises: (1) reacting 3,7,11-trimethyldodeca-1,4,6,10-tetraen-3-ol with triarylphosphane and a hydrohalic, sulfuric, sulfonic, phosphoric or 1-6C alkanoic acid at -20 to 40 [deg] C to give 3,7,11-trimethyldodeca-1,4,6,10-tetraen-3-yl-phosphonium salt (III); and (2) rearranging (III) at 40-100 [deg] C to form the primary salt (I). [Image] R : aryl; and X : the anion of hydrohalic, sulfuric, sulfonic, phosphoric or 1-6 C alkanoic acid.
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