Chiral center Q

[Jo07]

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Given a complex multi-ring structure...is there any trick/easy way to quickly find the number of chiral carbons? I always seem to miss them.

 

[shoombol tallah]

Two things that help eliminate almost half the choices are A) all double bonds are achiral B) all CH2's are achiral. You do that and you'll eliminate most if not all of the wrong choices.

 

[Clubby]

Two things that help eliminate almost have the choices are A) all double bonds are achiral B) all CH2's are achiral. You do that and you'll eliminate most if not all of the wrong choices.

True, but not all double bonds are optically inactive. Make sure you see what the question is looking for.

 

[shoombol tallah]

thats true be aware that some double bonds like those of allene (cumulated double bond) can be chiral with the right substituents. But usually the douple bond approach works quit well on large molecules.