[Dolphinsiu]

The reagent for the first equation is
1. O3
2. Zn/H2O

But do you know what reagent will change into the second equation?
Thank you! (This is past paper question, but I cannot think out of any reagent although it may be taught.)

[sjb]

But do you know what reagent will change into the second equation?
Thank you! (This is past paper question, but I cannot think out of any reagent although it may be taught.)

What reactions do you know that will convert two carbonyls to a conjugated enone?

S

[Dolphinsiu]

http://en.wikipedia.org/wiki/Knoevenagel_condensation

Is it related to above website?

1. CH2Z2
2 - H2O

am I correct?

[refid]

I think this is  a simple adol condensation, deprotonate at an alpha hydrogen, count from enolate to next carbonyl carbon you get your seven&five membered ring

i remember from school these questions were tricky

[refid]

intramolecular aldol condensation i beleive is what its called

[Dolphinsiu]

o i c!

The reagent can be

1. OH-
2. H+ / -H2O

or

1. H+
2. OH-/ -H2O

but there is 2 carbonyl group! Do adol condensation really work?

[refid]

one of the carbonyl's a-carbon would lose an a-hydrogen & form the enolate.... the second carbonyl carbon would serve the enolate attack position