HO naCN OCHCHOCN (7) nCBC≡c+ (1)Et20 nC4HC≡ CMgCH2CH2OH (2)H3O 5、推测下列反应的机理。 (CH3)COK OH CH3 H3CHC—C OC(CH3)3-- H2C=CHC(CH3)2 H3 CHCC=CH2 H2 (CH3)3COH 2HC-CHC(CH3)2+ H3CHCC-CH2 (CH3)3CO CH3 (2)HOCCH=CH HOBr C(H3C)2--CHCH2Br CH3 ABr coh HOCCH-=CH CH3CH-H—cH2 H2Br (H3C)3C CH2 Br 6、写出下列化合物如何合成 (1)(CH3)3COC(CH3)3(对酸性试剂非常敏感) D)Hg(oAch ( CH3)2C-CH2 +(CH3)3COH CH3)3COC(CH3)3 2)NaBH3 (6) O + NaCN H2O HOCH2CH2CN 4 (7) n-C4H9C CMg + O (1)Et2O (2)H3O + n-C4H9C CMgCH2CH2OH 5、推测下列反应的机理。 5 (1) O H3CHC C(CH3 )2 (CH3 )2CO -K + (CH3 )2COH H2C C H C(CH3 )2 OH +CH2CHOHC CH2 CH3 O H3CHC C CH3 C H2 H -OC(CH3 )3 H2C CHC(CH3 )2 O - + H3CHCC CH2 -O CH3 (CH3 )3COH -(CH3 )3CO - 2HC CHC(CH3 )2 OH + H3CHCC CH2 CH3 HO (2) HOCCH CH2 CH3 CH3 + HOBr O C(H3C)2 CHCH2Br HOCCH CH3 CH3 CH2 Br OH CH3CH H:O: CH3 HC Br CH2 H O+ CH2Br H3C H3C H + O (H3C)3C CH2Br 6、写出下列化合物如何合成。 （1）(CH3)3COC(CH3)3 (对酸性试剂非常敏感) (CH3 )2C CH2 + (CH3 )3COH 1) Hg(OAc)2 2) NaBH4 CH3 )3COC(CH3 )3 6