Organic Chem

This is a question which i just want to make sure of..

C(triplebond)C-CH2-CH3

so this would be called butyne
but can it also be called 1-butyne

Ygggdrasil
Gold Member
H-C(triplebond)C-CH2-CH3

is 1-butyne. The name butyne is ambiguous because it could refer to 1-butyne or 2-butyne (see below), which are different molecules.

CH3-C(triplebond)C-CH3

alright suppose i was given hexene and i was told to draw it, i would assume the double bond is at 1, right

alright suppose i was given hexene and i was told to draw it, i would assume the double bond is at 1, right

Yes Right, hexene means 1-hexene and the double bond either on the right or on the left of the structure { C(d.bond)CH2...etc) or (CH3...etc.....C(d.bond) }
Only numbers over 1 are given to determine the location of the double and the triple bonds.

thanks

Borek
Mentor
Only numbers over 1 are given to determine the location of the double and the triple bonds.

That's only a convention, and not a widely spread one. Whenever there is a risk of ambiguity, go for 1-somethingene, as it is much cheaper to add 1- each time on paper then to use incorrent reagent once.