Interference 103,482
While ethylene (H C=CH ), propylene (H C=CH-CH ) and butylenes2 2 2 3
are all olefins, only alkylenes having four carbon atoms or
more can be a 1-olefin or a 2-olefin. Consequently, one
isomer of an unsaturated hydrocarbon of four or more carbon
atoms can only
be distinguished from another by indicating the position of
unsaturation, e.g., H C=CH-CH -CH is 1-butylene; CH -HC=CH-CH2 2 3 3 3
is 2-butylene. Propylene can only be 1-propylene.
(3) Olefin polymer, polyolefin, or polyalkylene
Olefins or alkylenes polymerize by addition at the
points of unsaturation, i.e., through the double bond, to form
saturated olefin polymers, polyolefins, or polyalkylenes.
Ethylene (H C=CH ) produces polyethylene (-CH -CH -CH -CH -CH -2 2 2 2 2 2 2
CH -CH -). Propylene H C=CH-CH produces polypropylene; e.g.,2 2 2 3
polypropylene comprising isotactic sequences including “meso”
dyads m having two successive methyl groups on the same side
of the polymer plane:
(-CH -CH -CH -CH -CH -) or
2 2 2 2 2
2\ \ \ \
CH CH3 3
“meso” dyad m
or “meso” triads mm having three successive methyl groups on
the same side of the polymer plane:
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