of 7
All materials on our website are shared by users. If you have any questions about copyright issues, please report us to resolve them. We are always happy to assist you.
Related Documents
  CHM 234: Worksheet #1  Fall 2011 Due: Tuesday, August 30 th  in cass  Dr. Halligan  A! ine Ange$keeta $tructures One of the most important things to become comfortable with right away in OrganicChemistry is line angle structures (also called s!eletal structures #. $n a line anglestructure% the carbons and hydrogens are not drawn in. $t is assumed that each carbonhas a sufficient number of hydrogens so that it has a total of & bonds. 'ince hydrogenonly has 1 alence electron% it can only hae one bond. )lways include lone pair electrons for the heteroatoms (i.e. *% O% halogens% etc.#. +his will be ery importantfor writing reaction mechanisms. ,eometry is important when you draw line anglestructures so ta!e note of that in the e-amples proided. %&a'(es: a.Here are seeral ways to represent 2)Methy(entane . +he structure on the left is the line angle (s!eletal# structure. +hey are a lot uic!er to draw and easier to wor! with for this course. CCCCCCHHHHHHHHHHHHHHC 6 H 14 2-Methylpentane CH 3 CH 2 CH 2 CH(CH 3 ) 2  b.Here are some e-amples of structures that include heteroatoms. Do you recogni/e some of these functional groups (i.e. !etone% amide% alcohol% al!ene% al!yne% ether% ester% amine% nitrile% aromatic ring% etc.# oo! in chapter  for assistance. NH 2 OH 2 CH 2 CCH 2 CHH 2 CCNH 2 OOHCCCCCHHHHHHHHHOHOOCCCCCCCOOCCHHHHHHHHHHHHHHC 5 H 10 OC 9 H 14 O 2 C 6 H 11 NO 1.2.3.  *ro+e's: 1.Determine the molecular formula for the following structures ( a)  #. 3rite in the missing lone pairs of electrons.  -!Degree o .nsaturation 3hen determining a possible structure for a molecular formula% it is helpful to calculate the total number of rings 4 pi bonds ( Degree o .nsaturation # that the structure will hae. %&a'(e: 5roide  possible s!eletal structures for C / H 10  . irst  calculate the Degree of 6nsaturation7 U =2C + 2 - (H + X) + N2U  = Degree of Unsaturation (total numer of rings !lus !i on s) C  = numer of #arons H  = numer of $% rogens X  = numer of $alogens (&' Cl' r' ) N  = numer of nitrogens Note:  *$e numer of o+%gen atoms oes not a!!ear in t$is e,uation- U =2C + 2 - (H + X) + N22(7) + 2 - (10 + 0) + 02 = U = 14 + 2 - (10 ) + 02 = 16 - 10262 == 3 Note:  (e #areful .it$ t$e or er of o!erations in t$is e,uation- /an% !eo!le get t$e .rong $econd,  draw a structure that has 8 carbons and a degree of unsaturation of  (total number of rings and pi bonds#. $nclude the o-ygen atom in this structure% !eeping in mind that o-ygen gets two bonds. $f you do this% you will automatically hae the right number of hydrogen atoms. OHOO C 7 H 10 OC 7 H 10 OC 7 H 10 O  *ro+e's: 2.Calculate the Degree of 6nsaturation then proide two possible s!eletal structures for each molecular formula. Draw in lone pairs of electrons where appropriate.a.C & H 9  * b. C : H 10 O 2 c. C  H 8  *Od. C ; H 10 Cl 2 e. C 11 H 11  *O


Jul 23, 2017
We Need Your Support
Thank you for visiting our website and your interest in our free products and services. We are nonprofit website to share and download documents. To the running of this website, we need your help to support us.

Thanks to everyone for your continued support.

No, Thanks