Hydroboration–oxidation: propene → propan-1-olहाइड्रोबोरॉनन–ऑक्सीकरण: प्रोपीन → प्रोपेन-1-ऑलHydroboration–oxidation: propene → propan-1-ol

Class 12 Chemistry · Chapter 7 · interactive diagram

Parts and what they mean

• Propene, an unsymmetrical alkene (प्रोपीन, एक असममित ऐल्कीन) — The two C=C carbons carry different numbers of H atoms (1 and 2).
• Diborane, (BH₃)₂ (डाइबोरेन, (BH₃)₂) — Adds H–B across the double bond.
• Alkylborane formed in the first addition (पहले योग में बना ऐल्किलबोरेन) — B is on the terminal CH₂ (the carbon with more H atoms).
• Trialkylborane (CH₃CH₂CH₂)₃B (ट्राइऐल्किलबोरेन (CH₃CH₂CH₂)₃B) — Each B–H adds to another propene molecule until three propyl groups sit on B.
• Product: propan-1-ol (3 molecules per B) (उत्पाद: प्रोपेन-1-ऑल (प्रति B तीन अणु)) — Oxidation by H₂O₂ in aqueous NaOH replaces each C–B by C–OH.
• Regioselectivity of hydroboration (हाइड्रोबोरॉनन की स्थान-वरणता) — The alcohol looks as if water added opposite to Markovnikov’s rule. Reported by H.C. Brown (1959).
• Acid-catalysed hydration gives propan-2-ol instead (अम्ल-उत्प्रेरित जलयोजन से प्रोपेन-2-ऑल बनता है) — Same alkene, different reagent, different alcohol.

Original diagram drawn by Simple Learning Hub, based on the NCERT textbook. Report a mistake