my.escape

gone.

will i be back?
i don't know.
maybe i've started elsewhere.
maybe never. again.

lunes, octubre 06, 2003

[ 361. Home ]

Just got home from studying at the airport... ok, before anything else, i got a confession to make. I skipped 2 hours of consultation. Haa... and it was physics anyway. Well, got home for a while, came online and found that derek's at home. Thought he'd still be in camp... talked to him for a while, and then realized that things has changed... argh~ never mind... nonetheless, it's great to hear him doing fine. Then went over to the airport. I conveniently sat at the table next to derrick, and i can almost feel how he felt: "This guy look very familiar... but he looks as if he don't know me... is he xuan? I dunno... i think i should message him... but cannot be lah, how can it be so coincidental? He just saw me on saturday... and it's barely 2 days later?!" So i played along with him... and pretended that i didn't know him... haa... and really, he didn't say anything. Then small michael came... rather unexpected, but it was good company anyway... he's so small and cute!!! Hee... really adorable, but guess we gotta learn to treat him as an adult. =) Until like 5 plus, i messaged eng how to call derrick... then derrick realized it's really me. Well... the rest is history. I left the airport at about 8, having done an assortment of stuff from sajc fmaths paper to rjc chem paper... and boy, it's really tough. Try this:

Side chains with two carbon atoms can be introduced into a benzene ring by either Friedel Craft alkylation or Friedel Craft acylation, using chlorine-containing compounds in the presence of AlCl3 as a catalyst.

(a) With the aid of equations, describe the mechanism involved in the Friedel Craft acylation reaction between benzene and ethanoyl chloride. [3]
(b) Explain why AlCl3 can act as the catalyst in this reaction. [1]
(c) Friedel Craft acylation is usually preferred over alkylation. Discuss why this is so in relation to the follow factors:
i. the reactivity of the reactants, with reference to the C-Cl bond.
ii. the susceptibility of the aryl ring to polysubstitution.
iii. the reactivity of the products to polar reactants. [6]

I have a few personal questions:
a. have we learnt this Friedel Craft alkylation/acylation?
b. what is polysubstitution?
c. have we even learnt how to add a -CH3 group to a benzene ring?

Argh...!!!

Shannon left at 9:11 p. m..

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gone. will i be back? i don't know. maybe i've started elsewhere. maybe never. again.