Give examples of steric effects, Chemistry

Assignment Help:

Give Examples of steric effects

These are both examples of steric effects. Placing three highly branched groups around a central boron results in van der Waals repulsions. These repulsions are severe enough that only two groups can be bound to boron in the case of disiamylborane, and only one group in the case of thexylborane. (Notice the greater number of alkyl substitutions in the "thexyl" group.) Now, alkyl branches stabilize sp2-hybridized boron (see the solution to Problem 4.48 on p. 62 of the Study Guide and Solutions Manual) just as they stabilize sp2-hybridized carbon; but if the alkyl branches are themselves branched, they form a thicket of methyl groups that interact repulsively with each other as more of these branches are accumulated. These repulsive interactions reduce the relative stability of the trialkylboranes-evidently, so much so that they cannot form.

 


Related Discussions:- Give examples of steric effects

Acid and base equilibria, net ionic equation for the reaction between aqueo...

net ionic equation for the reaction between aqueous solutions of perchloric acid and rubidium hydroxide

Structure of aldehydes and ketones, Structure of Aldehydes and Ketones ...

Structure of Aldehydes and Ketones Carbonyl carbon atom is connected to three atoms by sigma bonds. As these bonds use Sp 2 -orbitals, they found in the same plane and are 120°

The number of unpaired electrons, The number of unpaired electrons in  1s 2...

The number of unpaired electrons in  1s 2 2s 2 2p 4   is: (1) 4        (2) 2        (3) 0        (4) 1 Ans: 2

Berzilius hypothesis, explain Berzelius hypothesis and contradiction of dal...

explain Berzelius hypothesis and contradiction of daltons hypothesis with an example

Determine uncertainty in momentum of an electron, The uncertainty in moment...

The uncertainty in momentum of an electron is 1 x 10 -5 kgm/ s  . The uncertainity in its position will be( h= 6.63 x 10 -34 Js) : (1)  5.28 x 10 -30 m

Organic compounds., methods of purification of organic compounds with diagr...

methods of purification of organic compounds with diagrams ..

The electronic configuration of gadolinium (atomic no. 64), The electronic ...

The electronic configuration of gadolinium (atomic no. 64) is: (1)  [Xe]4s 8 5d 9 6s 2                           (2) [Xe] 4s 1 5d 1 6s 2             (3) [Xe]4s 3 5d

What is the extent of h-bonding in hf, Since flourine is very electronegati...

Since flourine is very electronegative as a result hydrogen makes a very positive character.as a result the H-bonding is very strong because of large difference in electronegativit

What is spontaneous reactions, Q. What is Spontaneous reactions? Ans. ...

Q. What is Spontaneous reactions? Ans. Spontaneous reactions can occur under specific conditions without any assistance. Most of the reactions you know are spontaneous r

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd