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    I need some help quite urgently, I've been trying to come up with some sort of 'reasonable' answers to these:


    and


    i've worked out 7a) i) properly so far, but has anyone got any ideas/hints towards some sort of answer I can write for any of the rest?
    I also think a sulfur ylid can be used to make the epoxide for ii), but i'm not sure about making the ring

    I'm actually diabolically bad at retro style questions.
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    for 7a)ii) consider using possibly allyl cuprate to add 1,4 - then add HBr across the double bond to give the bromide - then use the enol(ate) to do an Sn2 to displace the Br and form the ring - finally the sulfur ylide as you've suggested.
 
 
 
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