{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

SCAN0009 - lsotaetic WW saw so Syndiotaotlo ¥Ataczic...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: lsotaetic WW saw so Syndiotaotlo ¥Ataczic Polypropylene - random stereochemistry of methyl groups attached to main chain (stereorandom) propertie.or fibers etc. formed by free-radical polymerization ysotactic Polypropylene stereoregular polymer; all methyl groups on same side of main chain useful m .-—’——" properties prepared by coordination polymerization under Ziegler—Natta conditions 31> Syndiotactic Polypropylene - stereoregular polymer; methyl groups alternate side—to—side on T useful properties prepared by coordination polymerization under Ziegler-Nana conditions \DLQ 3 fig dig}; Stereocenters other than C . Silicon, like carbon forms four bonds' In its stable compounds and many @ 7.16 ilicon compounds “-—-----.—- have been resolved mm 9 b Si—d d—Si C \ £11“ Nitrogeié' m amines— pyramidal geometry at nitrogen can produce a chiral structuregenantiomers (O quilibrateEoo rapidly E0 be resolved b S a f 3 32‘ = very ast : N, c/N \c Phosphorus in phosphines - pyramidal geometry at phosphorus can produce a chiral structure; pyramidal Q’m , inversion slower than for amines and compounds of the type shown have been resolved :3 '57) 0 <3 3 b b C. E E ‘3 ‘5 slow --—~:-— ‘__ a ll'l’I’ 'U o/\ / , L,.§ x 7 .- 1" .1“. 2 #va ‘I‘ /’“‘\\ 7 . ix i \J hsi‘~ I ’N C i ‘\J 9El Xx \ g ‘53» ‘r xx) *" XS/ \\ ‘ .‘V-MS \J (/3 ~71?“ ~ f. as) \3- 5: \ gilt? ‘4 a l :s k: L - é ng « ‘3 er‘ a c“ u ‘5: t e i \«5 we r o as E» 3‘s: \ ‘(h ‘ ' r‘ K VJ KO j E {y , ’9.“ ,, y , (,1 ,1 < ,I' (/2 yrmfi Jig/1&7 7%: J/b/ l» l: ...
View Full Document

{[ snackBarMessage ]}