Vol. $3, No. 11, November 1968 NOTES 4291 fairly active. Tertiary amines are active but cause darkening during the reaction. Similar experiments demonstrated a strong solvent effect on the reaction. Mixtures of solvent, 1, and tri-phenylphosphine in a 40: 5: 1 ratio were heated at 85” for 1 hr. In solvents of relatively low polarity (chloroform, benzene, o- dichlorobenzene) the conversion into 2 was 1.6 to 2%. Increasing polarity gave higher ...
