Basic hydrolysis of l,4-bis(triphenylphosphonio)buta-1,3-diene dihalides
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Basic hydrolysis of 1,4-bis(triphenylphosphonio)buta-1, 3-diene dichloride with 10% NaOH gave isomeric 4-diphenylphosphoryl-4-phenylbut-1(2)-enes and 1-diphenylphosphoryl-1-phe-nylbuta-1, 3-diene, the products of anionotropic migration of a phenyl group from the P atom to the α-position. Hydrolysis with Na2CO3 afforded only the diene product. In both cases, triphe-nylphosphine and triphenylphosphine oxide were isolated as secondary products. Dehydro-chlorination of 2-chloro-1,4-bis(triphenylphosphonio)but-2-ene dibromide with triphenylphosphine was proposed as a new convenient route to 1,4-bis(triphenylphosphonio)buta-1,3-diene dibromide.
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