knmboc

My next compound is the t-boc-gly







The boc compound has two differnts conformations and they are: All the hydrogens are going to be affected by the two conformations. The cis and trans t-methyl group are right on top of each other we don't see any couplings. The hydrogen numbered 1 has theree methyl groups on the same carbon and they are equivilant of each other therefore only shows one peak (s,9H) at 1.4ppm. the integration also shows that each hydrogen is represented by the digit six, and the presense of 9 hydrogens (9.1). Hydrogen number two is not alligned to be on top of each other so we see the coupling effects of the trans and cis product and see the two triplets. the intagration was consistant with the one hydrogen and the calculated value for J constant was 4.86Hz which is close to 5Hz. Hydrogen three is a quintet because of the coupling effect of cis-trans conformation. also they third hydrogen has a J constant equal to 5Hz and the calculated value was 5.2 Hz, which co-relates. Then the hydrogen four which shows up at1.25 ppm is a carboxylic acid which is supposed to be between 12-15ppm. but because of the shortage of space in the graph, it only goes up to 12. In reality the peak was to appear at 12.1 ppm. The integration also approves of this.

=Grade: 5/10= No such thing as t-methyl. Too many spelling errors. The ratio of the rotamers is not calculated. What is the relevance of 4.86 Hz being close to 5 Hz? The H3 peaks are doublets, not quintets. The structures are missing charges. H4 shows up at -1.25, not 1.25 ppm.