...J. Org. Chem. 1985,50, 910-912 910 Scheme H I a H N+ C02Et 7c. d H (CHz),, s 0 Sc, d COzEt 8 ( I c , n = l ; d , n = 2. to pyrazolinones 6a,b together with ylides 5a,b as minor products. Bridged 2-pyrazolin-bones 6a,b, whose structures are supported by 'H and 13C NMR spectroscopy, show two strong infrared absorption bands in the 17001800-cm-' range. The first band (1740 cm-') is assigned to the ester carbonyl while we attribute the second one (1765 cm-' for 6a and 1760 cm-l for 6b) to the amide carbonyl. These abnormal high values for an amide band reveal, in accordance with Bredt's rule, an important inhibition of the N-C=O resonance in these N-bridgehead lactams." On the other hand, ' NMR spectra of the crude maH terials obtained from diesters 4c,d at 390-400 "C showed the characteristic signals of a terminal vinyl group suggesting that an elimination reaction follows or competes with the [1,4] migration. Flash column chromatography of the mixture resulting from the thermolysis of the piperidine derivative 4c afforded besides the pyrazolinone 6c12an isomeric N-alkenyl compound whose spectroscopic datal3support the hydroxy-bpyrazole structure 7c. The analogous elimination product 7d formed in lower yield (15% estimation on the basis of 'H NMR spectra) could not be isolated. Pyrazolinone 6c submitted to flow pyrolysis at 400 O C was recovered unchanged. Thus hydroxy-bpyrazoles 7c,d result from an intramolecular elimination...
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...------------------------------------------------- Top of Form Search Bottom of Form Home» Reference and Education» College University Ads By Google StudyGood Study HabitsStudy Skills TestHow to Study Veronica M. De Escobar Basic PLUS Author | 16 Articles Joined: January 23, 2008 Was this article helpful? 10 1 Ads by Google BSc Psychology Online www.rdi.co.uk/psychology Study In Nigeria - UK Universities. Apply Online Now For Home Study ACCA Distance Learning StudyInterActive.org/ACCA-Distance Access Full Syllabus Online. Live & Recorded HD Video. Tutor Support! Study in Georgia,Europe www.studyingeorgiaeu.com Affordable quality Universities as low as $1500. Visit us at. A-level Diploma abroad www.ef.com Complete the A-level abroad at the EF International Academy Math Practice - Ages 5-15 www.IXL.com/Math A K-12 math website kids LOVE — Win awards, certificates, have fun! GTBank Mobile Money www.gtbank.com/mobilemoney Send Or Receive Money With GTBank. Mobile Money. Simple Money Transfer Good Study Habits and Academic Achievement Walk Hand in Hand By Veronica M. De Escobar Ads by Google Study in Scotland Study a Postgraduate course in Scotland. View course list here! gcu.ac.uk/postgraduate Consider an SJD from UCLA A small, elite doctoral program for budding legal academics. www.law.ucla.edu/sjd Free IELTS Practice Test Take our 21 minute practice test and get your results right away. www.testden.com If you are reading this article...
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...CLASSIFICATION TESTS FOR HYDROXYL- AND CARBONYL- CONTAINING ORGANIC COMPOUNDS Group 3 2H Medical Technology Organic Chemistry Laboratory ABSTRACT Classification of Hydroxyl and Carbonyl containing compounds was done through different tests. The samples were n-butyl alcohol, sec-butyl alcohol, tert-butyl alcohol, acetaldehyde, n-butyraldehyde, benzaldehyde, acetone, acetophenone, and isopropyl alcohol. Each of the samples were tested through solubility test of alcohols in water, Lucas test, Chromic acid test or the Jones oxidation test, 2,4-Dinitrophenylhydrazone (2,4-DNP) test, Fehling’s test, Tollens’ silver mirror test, and Iodoform test. Solubility test of alcohols in water was used to determine the amount of water needed for it to produce a homogenous dispersion and determine whether what kind of alcohol is soluble and insoluble in water. Lucas test was used to differentiate primary, secondary, and tertiary alcohols. Chromic acid test was used to determine if the sample is oxidized and can also be used to differentiate ketones from aldehydes. 2, 4-Dinitrophenylhydrazone test was used to differentiate aldehydes and ketones. Fehling’s test and Tollens’ silver mirror test was used to determine whether the sample is an aldehyde. Lastly, Iodoform test was used for classification of methyl ketones. INTRODUCTION Hydroxyl compounds are those containing the hydroxyl group –OH. They can be classified into primary(1o), secondary(2o), tertiary(3o) alcohols, and phenol...
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