Compounds of Formula 9, where A is an alkenyl group having one or more double bonds can be made for example, by synthetic schemes well known to the practicing organic chemist; for example by Wittig and like reactions, or by introduction of {HEAD ~ a double bond} by {TAIL ~ elimination} of halogen from an alpha halo arylalkyl carboxylic acid, ester or like carboxaldehyde 
Compounds of Formula 9 , where A is an alkenyl group having one or more double bonds can be made for example , by synthetic schemes well known to the practicing organic chemist ; for example by Wittig and like reactions , or by introduction of { HEAD ~ a double bond } by { TAIL ~ elimination } of halogen from an alpha halo arylalkyl carboxylic acid , ester or like carboxaldehyde
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