What does pABSA Do?

I am unfamiliar with its reactions with lactones.  In its reactions with ketones, the rest of the molecule leaves.

For info, pABSA was developed as a safer alternative (by Merck I think, could be wrong) to the more commonly used tosyl azide - less potential for explosion. A look into the chemistry of tosyl azide should yield more examples of its reactivity.

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p-ABSA, p acetamidobenzenesulfonyl azide, what does it do?

I have never used this structure. I know that it does a conversion of lactone to a diazo compound. But does it only leave the double nitrogens while the rest leaves.

Thats what it seems to do - diazo transfer. I dont know much more,  but it shouldnt be that difficult to search for more examples and/mechanism in literature
http://en.wikipedia.org/wiki/Diazo#By_diazo_transfer

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