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C O 2 E tC O 2 E t i . O H ( a q )i i . H + , ?C O 2 E tC O 2 E tOE t O 2 C H 2 C H 2 C E t O N a C O 2 E tOE t O 2 C H 2 C H 2 COC H 2 C H 2 C O 2 HOO 2 . Z n H gH C lH O O COH O O CA l C l 3O OOH FO P h 3 P + C H 3B u L i i i . H 2 O 2 , O H C H 2 O Hi . B 2 H 6C H 2 C H OP C C C H 3 N H 2N i / H 2C H 2 N H C H 3 3 . i . M g / E t 2 Oi i . M e 2 C = OH C H OH C l , Z n C l 2C H 2 C l C H3O HC H 3P h C H 2 i . P B r 3i i . M g / E t 2 OC H 3M g B rC H 3P h C H 2C H 3C H 2 C H 2 O HC H 3P h C H 2O i . N ai i . C 2 H 5 B rC H 3C H 2 C H 2 O C 2 H 5C H 3P h C H 2