{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

29 - 9 what-Wm"Mm haw!” or cw“'hnw 0F'0 C Rem 13 1...

Info iconThis preview shows pages 1–13. Sign up to view the full content.

View Full Document Right Arrow Icon
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Background image of page 2
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Background image of page 4
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Background image of page 6
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Background image of page 8
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Background image of page 10
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Background image of page 12
Background image of page 13
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 9+ what-Wm - "Mm haw!” or, cw“ 'hnw. 0F '0} C Rem 13% 1) QHEMTQAL erFr Protons in different chemical (and magnetic) environments absorb energy at different fre- quencies. This is called the chemical shift phenomena and it is measured relau’ve to 0 for tetrarnethylsilane. TYPICAL CHEMICAL SHIFT? Type of Proton Chemical Shifts, 8. ppm R—CH3 0.5-1.5 R—CHz—R 1.0-1 .5 R2C=CH2 5.0-6.0 Ar—H ' 7.0-8.0 R—CaC—H 2.0-3.0 R2C=CR—CH3 1.8-2.2 Ar—CH3 2.0-2.5 RCO—CH3 2.0-2.5 RgNCH3 2.6-3.0 R—O—CH3 3.8-4.2 R—CHO 9.0-10.0 *These are representative values and near the center of a range for each type of proton. 2) AREA RELATIONSHIPS The area of the absorption at a given chemical shift is proportional to the number of protons giving rise to the absorption. Electronic integration appears on most Spectra as a series of steps - the height of the steps is proportional to the relative areas. 3) PIN- PIN PLIIIIN —FR '1‘ RDER PE A* The signal due to a given proton can be split due to Spin-Spin interactions with adjacent protons. This spin-spin splitting for first-order spectra is consistent with ad below. a) Magnetically non-equivalent nuclei separated by 1, 2, or 3 bonds Split with one another. Magnetically equivalent nuclei do not split one another in first-order spectra. b) The center of the multiplet is the origin of the chemical shift of the absorbing nuclei. The spacing of the lines in the multiplet is the coupling constant, 1, (Hz). c) Multiplicity caused by ni nuclei IS 2 nili + 1 where m: number of nuclei and 11— — spin quantum number for the ith nuclei. For protons this 15 2 nHl/Z + l— = 11}; + l. d) The relative intensities in the multiplets are statistical. Multip lets which arise from more than one coupling can be interpreted by the above guidelines for first-order spectra. This approach breaks down for complex spectra. chemical shift, Hz 2400 2100 1800 1500 1200 900 600 300 0 chemical shift, ppm (6) 2400 2100 1800 chemical Shift’ Hz 1500 1200 900 . o__fi;—QCH3)3 Her. 0-. chemical Shift; ppm (5) 600 39" chemicalafhift chemical shift Cbenficalbshifl of H ofH‘ of}; a 7'24 5 4.83 5 4.54 x, “x apply first splitting _/f \‘x ‘ Idzlél-[zl laz=l4Hz ’ ~ I ’ \ apply second Splitting _ *_——" h»: z A w = =7 _._ l FIR—.16“: H] -—u- £1,5— Zflo *— IIIc=ZHZ -I- -o— x V Molecular Formula : c S H .0 a PROBLEM 13 Molecular Weight : Additional Information : IIIIIIII“III.-fllIIIIIIEIfliflfliflflflllflllfllfllll III fl"null“HIIIIIIIIHEflflflflflflflfllflflflllfl===ggfllII flIII=IIIIIIIIIIIIIfiflfiflflflIIIflIIIIIIIIIIHIII IHII IIIIIIIII: IIIIEHEHIEIIIIIIEIIIIIIiII n E IIIIIIIIIIII IIII IIII IIIIIIIIIII IIIIEIHHIIII IIIIIIIIIIIIII IIIIIEIIIIIIIIIIIIIIIIIIII IflflIIIII II IIiIIIIIIIIIIIIIEIHIIIIIEIIIIIIIIIIIIIIIIMFIIIIH I: I IIIIIIIIIIIIIIIIIHIIIIIIII-IIIIIII IIIHII III I IIIIIIIIIIIIIIIEEIHIIIIIIEII IIIIIIIWE'ENHI III :I IIIIIIIIIIIIIIIIIIIIIIIII III IIIIIIIIIIHMIIIII II IIIIIIIIIIIIIIIEIIEIIIIBIIIIIIIIIHIIIIIIHMIIIII III::II:::IIIII:IIIEEEIEI IIREIIIIIIIWIIIIIIHNIIIIH III II IIIII Illlflnlfll HEIEIIIIIIHIIIIIIIHMIIIII III III IIEIIIIIIEflflflflfiflflflflilfifllflllflIIIIIIHHIIIIH III II I I lflflflflflflflflEIEIIIIIlM“II-IIUJIIIHE IIIII II III! III EEflflflfiflflfllflfifllIIIMIIIIIIHMIIIIE IIIIIIIIEIIIIIIIIIH IIHEHEEEEEEEIEIIIWIIIIIIHHIIIIW IIII III IIIIIIIEIIEIE a: EIIIIIIIIEWI:IIIIIPIIEIE I IIIIIEIIIIIIEIEEIIRIEIHEI I IIW1i IHIII I E 1_ III III IIIIEHEEEEEEII I A" ”m IIIIHIIIII IIIIIIIIIIIIIIIIEEI HIIIIIIIII IIIIIml III :=::==.."==========0===H==¥550==sw'"" mm di"'"'il - 1- b. if " a «.0 «p q.- we 5-0 H0 00 0.0 o 2- ' 4-0 M'QONS so ' e-o Hi 0-0 ”W 100 12-0 150 _——'lnfll_||-Il-l r—Ifluu—n-Iunnrzuuulaunzxn: ___________ #fi-IIIII!!IIIHflIflfllllflflflmmmg IIfiIl’i—I-l-Iu-u :-IIInImanual-muslmunnungzim III-III. iII-IIIl'lIIIIIlIfIIIllfl'llltlllll'flk I.lIIIIIl-lnllmwlulmm"Inllamuni;._ IIIIIHIIIIHHMIIIMMIIIIIMWWI¥ ,_ flflfifiEIIIIIIIIILIIIIIIEII IIIIIIIIIIIIIlIlIIIIIIIIIIIHHHIIIEE 39 $3.451 “III-IIIIIIIIIIIEEI IIIIIIIIIIIIHIIIIII Ill-IIIIIIIIiJ “mgflififlgfiIIIIIII IIIIIEEIIII IIIIIIIIIIII'IIIIIIIIIMIIIMIIIHE _: £2) fiifigfllII IIIJIIIIIIHIII IIIIIIIIII-”IlgilIIIIMIIIfllIIIEE < ggflfliflIIIII-IHIIIIIIIIII IIIIIIIIIIIIIIlIIIHEIHHIIIIIII E fliIIIII-IIIIIIIIIIIIIII III-IIIIII-IIIIIEHIMHIHIIIIIE WIIIIIIIIIII'IIIIIIIIII II IIIIIIIIIIIIIMIHMHIIIIIIIHQ E IIIIIIIIIIIIIIIIIIIII IIIIIIllIIIIIIIIIIHIIIIIHIMIMI .— IIIIIIIIIIIIIIIIIIII IIIIIIIJIIIIIIIIIIIIIIIHIIHHIIIIIE IIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIII 2uIIIIIIIIIIIIIIIIIIII IIIIIIHIIIIIIIIIIIIIIIIIIIIIIn IIIIIIII IIIIIIIIIII IIIIII1IIIEIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIII IIIIIl'lIIIIIIIIIIIIIIIIIIIIII IIIIII IIIIIIII “III-IIIIIIIIIIIIIQI _ IIII III III IIHIIIIIIIHIIIEEEE. 49100 3500 3000 1500 2000 1000 1000 1400 1200 1000 000 FREQUENCY (CM") FREQLENCY (CM") Recording Conditions NMR 1M in CC14. IR 4000-850 cm'l, 25 mg in 1 m1 001 850-625 cm'l, liquid film. 4, 0-11 mm cells. UV No appreciable absorption . 13C-NMR Spectroscopy CH,(2}lgCH;_.CI-lgflr I ...
View Full Document

{[ snackBarMessage ]}