Chcooh I

Scheme 4

COO'HN C(CH2OH)3

Scheme 5

CH2COOH Me

CH2COOH Me

(13) C0C6H4"4-C1

(13) C0C6H4"4-C1

daylight MeOH

MeO Hg lamj)

MeOH

daylight MeOH

CH2COOMe

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