%PDF-1.4 %���� Its molecular formula is \(C_4H_6O_2\). 1H NMR Tables. �nyo�BR�*i���h�N;n��3Ӻi�S3��XQH��^�آN~f���o���-on��o�J�/l-���l�Ȑ��Z � @�}��O&�� �Q��0~#W� �%����wۥt ���h:(�8 t�ʡ"� j�n�7� 7�9 ��حTr� j� r �������z�^��2Pw��t� t423��F0vk{�S��r����S����Z��l��u�d�r�&. This page has tables of 1 H Chemical Shifts and 13 C Chemical Shifts. 1H NMR Tables. H�|W�n�����H?p�]U���[`�q��/�iYYT �~Ω�;��@�9���O-�ᒷ7�E��z�4�C�V��Y�� Overview of typical 1H NMR shifts 1H NMR Tables . Unlike the 1 H NMR, there is no integration and signal splitting in 13 C NMR spectroscopy. 10–4! OH and NH). Proton Chemical Shift Ranges * * For samples in CDCl 3 solution. The following diagram depicts three pairs of isomers (A & B) which display similar proton NMR spectra. And the carbons being equivalent or nonequivalent is determined based on the same principles we discussed for proton NMR. No two carbons are in exactly the same environment. We are only looking at the number of signals that each non-equivalent carbon atom gives as a single peak! When significant portions of a molecule lack C-H bonds, little information is forthcoming by 1H NMR. (dipolarer Mech. >�����������-�_���돗�?l/^�����m_�p�������ݝly������Tz?�VJ�[�[+y7��;ȼ>�ݦ=%�3�?/7_�xs� ���w���V�l��#m�����JwX��u{|}��j�����&u�}��i���f$���ɮf���;����.�������_��������߾���=�|yE�����r��"~}����(Ep��^��(��^�ȯ����rM� -'��9ݟ�wM�vKq�� d��事��}�. FROM TABLE 14.4 (LABBOOK) OR TABLE H.6 (SPEC BOOK) FROM TABLE 14.6 (LABBOOK) OR TABLE H.4 (SPEC BOOK) 5.8 5.0 5.2 6.1 7.01 Experimental sp2 IH chemical shifts (ppm). Let's sort out what we've got. The only peak that comes before saturated C-H protons is the signal of the protons of tetramethylsilane, (CH3) 4 Si, also called TMS. Using the simplified table of chemical shifts above, work out the structure of the compound with the following C-13 NMR spectrum. Organic Chemistry Michigan State University: The broad ranges shown at the bottom of the chart (orange color) are typical of hydrogen bonded protons (eg. The d scale is relative to TMS at d=0. {r���]��>ƞ�耬����'��O��in��w���Hu�=�ԔG�܍ �Ȯ�/������w{F�%o1�����B ���,{V[�ON����>�e�䩱7�vp͒���$���"����Q�j�v~�����Z������.�u��i��ӟ�fŭB�aZ�o�^(v�)qk��`�r� We can see in the table that sp3 hybridized C – H bonds in alkanes and cycloalkanes give signal in the upfield region (shielded, low resonance frequency) at the range of 1–2 ppm. 5.8 5.0 5.2 6.1 7.01 Experimental sp2 IH chemical shifts (ppm). 4.6 C2H50 Z 4.27 582 5.3-5.5 Cl-13 5.60 5.0 5.6 5.12 4.68 5.8 4.9 5.91 6.4 6.2-6.4 5.1-5.4 CH3 5.9 C2H50 Z 6.12 Cl CH3 5.59 5.95 Down Field (X = o, Hal) Up Field TMS 12 10 . 1 0 obj << /Type /Page /Parent 71 0 R /Resources 2 0 R /Contents 3 0 R /MediaBox [ 0 0 595 842 ] /CropBox [ 0 0 595 842 ] /Rotate 90 >> endobj 2 0 obj << /ProcSet [ /PDF /Text ] /Font << /F2 52 0 R /TT2 93 0 R /TT4 91 0 R /TT6 53 0 R /TT7 54 0 R >> /ExtGState << /GS1 99 0 R /GS2 55 0 R >> /Shading << /Sh1 101 0 R >> >> endobj 3 0 obj << /Length 11638 /Filter /FlateDecode >> stream komplex: 1J CH; 2J CH überlagerte Signale Integrale nicht brauchbar: Relaxationszeiten verschieden für Substitutionsgrad. There are four peaks and four carbons. 1H NMR Tables Overview of typical 1H NMR shifts Note: alkene region modified from earlier handout.


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