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Organic Chemistry 2230; Chapter 5 Part B Notes

by: Amanda Biddlecome

Organic Chemistry 2230; Chapter 5 Part B Notes Chemistry 2230

Marketplace > Clemson University > Chemistry 2230 > Organic Chemistry 2230 Chapter 5 Part B Notes
Amanda Biddlecome
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These notes cover the second part of Chapter 5: Alkenes. The third part will be posted on Monday.
Organic Chemistry 1
Dr. Schroeder
Class Notes
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This 2 page Class Notes was uploaded by Amanda Biddlecome on Thursday February 25, 2016. The Class Notes belongs to Chemistry 2230 at Clemson University taught by Dr. Schroeder in Fall 2016. Since its upload, it has received 20 views.

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Date Created: 02/25/16
Organic  Chemistry  2230   Chapter  5:  Alkenes,  Part  B   February  22,  2016   Amanda  Biddlecome     1)  Nomenclature     -­‐all  previous  naming  rules  still  apply     -­‐parent  ends  in  the  suffix  –ene     -­‐alkene  is  higher  priority  than  halides     -­‐alcohol  still  has  to  be  part  of  the  parent     -­‐if  alkene  is  going  to  be  the  parent,  the  double  bonded  carbons  have  to  be  in     the  longest  carbon  chain       -­‐if  multiple  double  bonds  are  present,  put  the  prefix  (di,  tri,  etc.)  before  the  –   ene  but  after  the  parent  name  prefix       -­‐alcohol  takes  priority  of  alkenes     -­‐when  finding  the  spin,  a  double  bond  takes  priority  over  single  bonds     because  with  double  bonds,  you  have  one  carbon  bonded  to  another  carbon     twice     -­‐vinyl  carbons  are  sp  carbons   2     *bonded  to  the  parent  chain  and  then  double  bonded  to  something         else       *functional  group     -­‐allyl  carbons       *sp  carbon  bonded  to  a  vinyl  group       *not  part  of  the  parent  chain     -­‐cis,trans       *cis=two  methyl  groups  on  the  same  side  as  double  bonds       *trans=two  methyl  groups  on  different  sides       *old  system       *diastereomers       *cis=more  polar  with  a  higher  boiling  point       *arrangement=important       *can  only  use  this  when  you’re  talking  about  two  groups     -­‐E,Z  Naming  System       *4  different  things  on  double  bonded  carbons       *prioritize  left  and  right  by  atomic  size       *E=higher  priorities  are  opposite  (one  on  top,  one  on  bottom)       *Z=higher  priorities  are  together  (both  top  or  both  bottom)       *only  for  alkenes       *only  for  internal  double  bonds       *don’t  worry  about  E  and  Z  in  rings       *if  there’s  two  double  bonds  in  one  parent,  find  E  or  Z  individually  for         each  and  then  write  both  in  front  of  the  name  (Example:  (1E,2E))     -­‐Stability       *the  more  R  groups  attached  to  them,  the  more  stable  it  is:  low           potential  energy  and  isn’t  very  reactive  (more  substituted)       *trans  is  more  stable  than  cis     2)  Alkynes     -­‐single  bonds  end  in  –ane     -­‐double  bonds  end  in  –ene     -­‐triple  bonds  (alkynes)  end  in  –yne       *terminal  alkynes:  when  you  have  four  carbons,  the  terminal  one  is         attached  to  the  last  carbon  on  either  side  of  the  chain       *internal  alkynes:  when  you  have  four  carbons,  the  terminal  alkyne  is         attached  to  the  middle  carbons       *there  are  no  E  or  Z  alkynes     -­‐Nomenclature       *carbon  with  a  triple  bond=sp  hybrid;180  degrees;  sigma  bonds,  pi         bonds;  more  acidic  because  more  electronegative  than  alkanes  and         alkenes       *Systematic:  easiest,  meth….prefixes  (ethyne,  propyne,  1-­‐butyne)       *Common:  very  complicated;  based  off  of  acetylene  unit       *can  use  them  as  parents       *triple  bond  attached  to  something  else  but  not  the  parent=ethynyl       *triple  bond  attached  to  a  carbon  that’s  attached  to  something           else=propargyl  


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