Colourless to pale yellow, highly viscous liquid (can solidify at low temperatures)
Odor Strength
Medium
Producing Countries
Synthetic — manufactured worldwide
Pyramid
Base
A colourless, viscous liquid that smells of clean wood and cardboard — sandalwood stripped of its richness, leaving only the dry, balsamic skeleton. The oldest and cheapest of the synthetic sandalwoods. Not beautiful, but reliable: the molecule that made sandalwood-type bases affordable for functional perfumery.
Dry, clean, balsamic woody. The immediate impression is sandalwood-adjacent but distinctly synthetic — a flat, linear woodiness without the creamy-milky lactonic depth of natural East Indian sandalwood. A faint cashew-nut layered sits underneath. Less sweet and less creamy than Polysantol, far less potent than Javanol, and without the animalic warmth of genuine Mysore sandalwood. The material reads 'clean wood' more than 'sandalwood' — closer to the smell of freshly sanded furniture than to sandalwood temple smoke. At higher concentrations, a slight balsamic sweetness emerges, recalling vetiver's woody quality rather than sandalwood's skin-like warmth.
Evolution over time
Immediately
Immediately
Clean, dry, woody-balsamic. Sandalwood direction without sandalwood richness. A flat, linear woodiness with a faint cashew-nut undertone. No creaminess, no milk — just clean wood.
After a few hours
After a few hours
The woody character stabilises and warms slightly. A subtle balsamic sweetness appears — less sweet than benzoin, drier than vanilla. The cashew facet recedes. The material becomes more pleasant as the solvent note dissipates.
After a few days
After a few days
Notably persistent. A quiet, warm, woody-balsamic residue — the smell of an empty sandalwood box rather than the wood itself. 400-hour substantivity at full concentration means IBCH outlasts most other materials in a formula.
The Full Story
Isobornylcyclohexanol (IBCH, CAS 3407-42-9, MW 236.40 g/mol) is a bicyclic terpene alcohol — a norbornane ring fused to a cyclohexanol unit. The molecule was first synthesised in the late 1960s via a two-step process patented as US 3,499,937: acid-catalysed Friedel-Crafts alkylation of guaiacol with camphene (using BF₃ as Lewis acid catalyst), followed by high-temperature catalytic hydrogenation. The camphene undergoes skeletal rearrangement during the first step, producing three structural families — isocamphyl, isofenchyl, and isobornyl — each with multiple stereoisomers. The target isomer, 3-trans-isocamphylcyclohexanol, is isolated by fractional distillation.
Scent Character
The odour is woody, clean, and balsamic — unmistakably sandalwood-adjacent but lacking the creamy, milky richness of natural Santalum album oil. Where East Indian sandalwood is warm, dense, and lactonic, IBCH reads flat, dry, and slightly chemical. Think sandalwood through a clean filter: the woody architecture is present, but the body is thin. A cashew-like layered surfaces on close inspection. Compared toJavanol(which captures beta-santalol's creamy sweetness at 400 times greater potency), or Polysantol (rounder, more restrained), IBCH is a blunt instrument — it delivers sandalwood direction without sandalwood subtlety.
Chemistry and Trade Names
Commercial IBCH is not a single compound but a mixture containing 5–20% of the most olfactively active stereoisomers. The chemical structure of IBCH is deliberately modelled on alpha-santalol and beta-santalol, the primary odorant alcohols of naturalsandalwood oil.
Role in Perfumery
IBCH is the workhorse, not the star. In fine fragrance, it is a base-note fixative and woody filler — extending sandalwood accords without the cost of natural oil or the potency of newer molecules like Javanol orEbanol. In functional perfumery (soaps, detergents, candles), IBCH dominates because of its stability, low cost, and antibacterial properties — a 2001 patent (EP1181866A1) documented its efficacy against gram-positive bacteria at concentrations above 0.1%. Usage levels range from 5% in fine fragrance to 50% replacement for natural sandalwood in functional bases.
A 2001 European patent (EP1181866A1) demonstrated that isobornylcyclohexanol — the active molecule in Sandela — possesses significant antibacterial activity against gram-positive bacteria at concentrations above 0.1%. The patent proposed its use in antibacterial cleaning compositions, making IBCH one of the few fragrance molecules that doubles as a functional antimicrobial agent.
Extraction & Chemistry
Extraction method: Fully synthetic. Two-step process (US Patent 3,499,937, filed late 1960s): (1) Friedel-Crafts alkylation of guaiacol with camphene using boron trifluoride (BF₃) as Lewis acid catalyst, producing a mixture of isocamphyl, isofenchyl, and isobornyl guaiacol isomers; (2) high-temperature catalytic hydrogenation of these intermediates to yield the cyclohexanol products. The target isomer — 3-trans-isocamphylcyclohexanol — is isolated by fractional distillation. Starting materials (camphene from turpentine, guaiacol from lignin or petroleum) are inexpensive, making IBCH one of the cheapest synthetic sandalwood materials in production. The resulting product is a colourless to pale yellow, highly viscous liquid.
Molecular Formula
C₁₆H₂₈O (3-trans-isocamphylcyclohexanol, MW 236.40 — one isomer in a commercial mixture)
Colourless to pale yellow, highly viscous liquid (can solidify at low temperatures)
Boiling Point
302.00 °C. @ 760.00 mm Hg
Flash Point
> 230.00 °F. TCC ( > 110.00 °C. ) (est)
Specific Gravity
0.97000 @ 25.00 °C.
Refractive Index
1.49600 @ 20.00 °C.
In Perfumery
Base-note fixative and sandalwood substitute. IBCH anchors woody, amber, and skin-scent compositions with a stable, economical sandalwood character. Its 400-hour substantivity at full concentration makes it a tenacious material on the perfumer's organ. In fine fragrance, IBCH rarely works alone — it provides bulk and fixation while more expressive molecules (Javanol, Polysantol, Ebanol, Firsantol) supply the creamy, milky qualities that make a sandalwood accord convincing. Used at 5–15% of a formula, it extends and anchors these costlier materials. In functional perfumery, IBCH can constitute up to 50% of a sandalwood base, where its stability under alkaline conditions (soap) and high temperatures (candle wax) is a practical advantage. The molecule also functions as a general fixative for lighter materials — it slows the evaporation of citrus and floral top notes without imposing its own character, provided the dose stays below 3%. Above that threshold, its woody-balsamic presence becomes audible.
