[Winga]

According to IUPAC, it is 1-methylethyl.

Is there any abbreviation that just call it methylethyl?
(is it acceptable?)

[Mitch]

isopropyl is the abbreviation because it has 9 letters, methylethyl has 11.

[dexangeles]

if i remember right, isopropyl is the old name even before IUPAC nomenclature was established, but it is still an accepted name

[Winga]

Sorry, my question is that can I use methylethyl instead of 1-methylethyl?

[dexangeles]

i don't see why not, i see them in names in bottles for experiments all the time  

if it's in the 2 carbon, then it won't be methylethyl, but plain propyl
good question though

i wanna see other answers to this now that you re-phrased the question

[Winga]

But, is methylethyl acceptable according to IUPAC?

[nocommentes]

I think, that it would be better to call that radical as isopropil, it will allow to show every body your knowlege on Nomenclature. In articles authors usually use i-Pr - it's easier for understandig!

[Mitch]

Winga: No, it would not be. IUPAC has funny rules. If an abbreviation exists such that it has less letters than an other abbreviation, then the abbreviation with the smallest amount of letters must be used.

[dexangeles]

hmmm, but isopropyl is not IUPAC nomenclature right?
isn't it an old name that is just still accepted?
my book says it's 1-methylethyl, but isopropyl is acceptable still.