hyrdroboration and Diels-Alder reaction

Question 1

what is hydroboration-oxidation

Answer 1

two step process resulting in anti-markovnikov addition of water across a double bond
Alkenes react with BH3

Question 2

what is the regioselectivity of the addition of borane

Answer 2

boron will add to the least hindered end of the alkene

Question 3

what is the mechanism of borane addition

Answer 3

concerted process bond formation isn’t simultaneous C-B bond forms before C-H partial positive formed on more substituted C .

Question 4

what is the selectivity of hydroboration

Answer 4

syn addition BH2 and H in same direction

Question 5

what are the uses of organoboron species

Answer 5

useful reagents for modern syntheses, alkyl boranes with alkaline H2O2 produces alcohols

Question 6

what is the mechanism for the oxygen step of hydroboration-oxidation

Answer 6

LP from HOO- attacks empty P orbital on BR3 forming -BR3OOH, R group bonded to B migrates onto O and loss of OH group.
This repeats for the other 2 R groups leaving B(OR)3
B(OR3) undergoes hydrolysis forming B(OH)3 + 3ROH

Question 7

what makes hydroboration-oxidation anti markovnikov

Answer 7

H bond to more stabilised position

Question 8

whats is the Diels-Alder reaction

Answer 8

the reaction of an electron-deficient alkene with a conjugated diene giving cyclohexene

Question 9

what conformation does the diene need to adopt for Diels-Alder

Answer 9

S-Cid (synperiplanar) to react so both new C-C bonds formed on same side dienophile