Synthesis Of Triphenylmethyl Substituted Olefins Actone And Preliminarily Study On Living Radical Polymerization Of 2-methyl-5,5,5-triphenyl-1-pentylene-3-ketone

In recent years,optically active polymers have attracted much attention because of their unique functions such as molecular recognition,optical resolution for racemates and catalytic activity in asymmetric transformations as well.In general,bulky side-chain and hydrogen bonding are in favor of the formation of stable helical conformation for polymers,which endows them with high optical property and some special performance.In the present work,2-methyl-5,5,5-triphenyl-1-pentylene-3-ketone was synthesized by the reaction of 2-methyl acryloyl chloride with 1,1,1-triphenylmagnesium chloride,which was a derivative from triphenylchloromethane.On the other hand,we try to synthesize 4,4,4-triphenyl-1-butlene-3-one by many methods.The structure of monomers was examined through ¹H NMR and ¹³C NMR.Using AIBN,BPO or TPO as an initiator and SanlenCo（Ⅱ） or the l-menthol as chiral environment,we has attempted radical polymerization of 2-methyl-5,5,5 -triphenyl-1-pentylene-3-ketone.¹H NMR spectra proved that the addition polymerization took place in the C=C double bond.Polymerization production rate is 10%to 85%,molecular weight is 2000 to 3000.The polymer which obtains in 96 hours showed good solubility in common organic solvents such as THF,chloroform,and dichloromethane.When the Polymerization time expand to 22 days,60%proportion of the polymer don’t dissolve in any common solvents.The optical rotation of the polymer is relatively low at present,the value is between 0°to 12°.