Trending ▼   ResFinder  

Notes 3rd Year 2016 : Chemistry (Indian Institute of Science Education and Research (IISER), Mohali)

2 pages, 3 questions, 0 questions with responses, 0 total responses,    0    0
Nitya Singh
Indian Institute of Science Education and Research (IISER), Mohali
+Fave Message
ProfileTimelineUploads
 Home > nit_1603 >   F Also featured on: School Page

Formatting page ...

Three-atom electrocyclizations (4 electrons) Heating of oxiranes (epoxides) give the J.-P. Depr , A.E. Greene, Org. Synth., Vol. 377 (19 S.corresponding Pikul, E.J. Corey, Org. Coll. S. Pikul, E.J. Corey, Org. Synth., Coll.Coll. Vol. 9,Synth., 678,(1998). carbonyl ylids, which can be trapped by cycloaddition reactions.1,2 Y. Hamada, T. Shioiri, Org. Synth., Coll. Vol. 7, 135 (1990 O Cl 11. 630 oC 1,3-Dipolar cycloadditions 1,3-Dipolar cycloadditions O [2+2] Cycloadditions N P. Schiess, P.V. Barve, F.E. Dussy, A. Pfiffner, Org. Synth., Coll. Vol. 9, 28 (19 Photochemical [2+2] cycloadditions O h + 12. P CH 2Cl 2 Me I.ring Br ning, R. Grashey, H. Hauck, R. Org. Huisgen, H.by Seidl, Org.5,Synth., Coll. V I. Br ning, These R. Grashey, H. Hauck, R.proceed Huisgen, H. Seidl, Synth., Coll. Vol. 1124 (1973). openings stereospecifically conrotatory paths.1,2 78 oC R.L. Cargill, J.R. Dalton, G.H. Morton, W.E. Caldwell, Org. Synth., Coll. Vol. 7, 315 (1990 Oxford University Press, 2014. All rights reserved. O 13. EtOH Ph-CHO + PhNHOH + Q N Ph R O Questions I. Br ning, R. Grashey, H. Hauck, R. Huisgen, H. Seidl, Synth., 957 (1973). I. Br ning, R. Grashey, H. Hauck, R. Org. Huisgen, H. Coll. Seidl,Vol. Org.5,Synth., Coll. V 14. S h T U Oxford University Press, 2014. All rights reserved. Oxford University Press,University 2014. All Press, rights reserved. Oxford 2014. All rights reserved. 5a OMe Me 15. + TBSO CHO H V 5b 5c OMe for the formation of 5a, 5b and 5c 1- Provide an arrow pushing mechanism Me Mevia conrotatory or disrotatory. + and show whether the reactions proceed CHO CHO 2- Provide ? a molecular orbital representation for the transition state for the rearrangement of 5b TBSO to 5c. HINT: your answer requires O you to identify the HOMO of the pi system, and indicate how the symmetry of this HOMO is re ected in the transition state.

Formatting page ...

 

  Print intermediate debugging step

Show debugging info


 

 

© 2010 - 2024 ResPaper. Terms of ServiceContact Us Advertise with us

 

nit_1603 chat