引用第1515樓CKL於2009-04-07 23:08發表的“”:
我睇緊KK intensive
次次都無加wo
.......
唔洗conc. H2SO4 同唔洗reflux 的..
dilute H2SO4有H+ 一黎可protonate 個aldehyde /ketone 令到佢
reactive d,<-maybe no need to protonate the catbonyl group since the reaction is already quite reactive
2黎可以protonate 埋個alkoxide ion
所以,唔洗去到要加熱... 10-20 度已經好夠
一般黎講,我地都唔會成日用到conc. H2SO4 for catalyst, except esterification( 尼個因為有水個ester 會hydrolysis 同埋 個conc. H2SO4 抽到水ma)
ps.加油啊
頭先我睇08CHEM
係Paper 1 第2個sec 個d先勁難
Paper 2 org chem 個幾分溫得熟既真係都幾易汁分
[ 本文被卡卡....在2009-04-08 02:41重新編輯 ]