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Morphine acetylation to Heroin. Why not acetic chloride?

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sotirone:
Hello, I am studying for my exam and I have a question my professor has not explained.

She insists that to get Heroin from Morphine we have to use acetic anhydride instead of acetic chloride.
Numerous sources online claim that you can get Heroin from Morphine using acetic chloride but she does not agree.

The question that she may ask on the topic is why can't acetic chloride be used for the preparation of Heroin.

Any ideas?

rolnor:
It seems as if your professor is wrong, there is no reason you can not use acetyl chloride. You need to be carefull, ice-bath, pyridine, dichloromethane. Acetic anhydride is more simple, just dissolve and boil for a few minutes.

rolnor:
Its technically a transformation of drugs. But you are right, we should not discuss that here.

Borek:
OK by my book. We don't discuss recipes, but the chemistry behind reaction, especially without precise practical details, is OK.

Acylation is not in any particular way specific to drugs, it is just one of standard procedures used in organic chemistry.

sotirone:
She looks to be wrong but I have to find a suitable answer.

Could the answer be that, because morphine is highly basic, the acyl chloride can turn to a ketene?

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