substance

Methyltriphenylphosphonium bromide

A Wittig reagent precursor; a white hygroscopic powder (PubChem CID 74505). No ChEBI entry found (EBI OLS search by InChIKey and name, 2026-11-06).

Formula: C19H18BrP
CAS: 1779-49-3
InChIKey: LSEFCHWGJNHZNT-UHFFFAOYSA-M

Show in the process graph →

Made by

Methyltriphenylphosphonium bromide by semi-batch quaternisation of PPh3 with methyl bromide in toluene (820 t/a)Main productConcept · not reviewed

Used by

No process in the Atlas uses this yet.

When a process with this chemical is added to the library, it appears here.

Takes part in

C₁₈H₁₅P+CH₃BrgivesC₁₉H₁₈BrPProduct · Quaternisation of triphenylphosphine with methyl bromide · one process

Routes compared

One route in the Atlas makes Methyltriphenylphosphonium bromide: nothing to compare yet. A comparison appears when a second route is added.

Per 1 kg of Methyltriphenylphosphonium bromide: inventory from each route's LCI dataset, unallocated; footprints per the functional unit of their own LCA.

Route	Tier, design maturity, review status	Geography, year	Energy	Feedstocks	Key emissions	Footprint	Comparability
Methyltriphenylphosphonium bromide by semi-batch quaternisation of PPh3 with methyl bromide in toluene (820 t/a)Batch plant: PPh3 dissolved in recovered toluene (20 wt%), liquefied methyl bromide dosed over 3 h into the closed, nitrogen-padded glass-lined pressure vessel at 333 K (semi-batch, 1.05 mol per mol PPh3 with the recycled excess), the salt precipitated and cooled to 313 K, filtered, reslurry-washed with recovered toluene and vacuum-dried at 333 K in an agitated filter-dryer; the toluene and the excess methyl bromide distilled in a batch still and reused; 1057.10 kg per batch, 776.6 batches a year on a dedicated train	flowsheet or hand-writtenDesign maturity: Concept (research)Not independently reviewedDataset review: unreviewed	GLO, 2026	Electric power: 0.154 kWh LP steam 350 kPa(a) (R-101 heat-up, the dryer's hot-water circuit, the still): 0.767 kWh	Triphenylphosphine (merchant): 0.744 kg Methyl bromide, liquefied (merchant): 0.281 kg Toluene make-up (merchant): 0.0559 kg Nitrogen for inerting and padding R-101, sweeping its headspace, pressing F-101 and breaking its vacuum, blanketing C-101: 0.0974 kg	none	no footprint	–

ISO 14044 requires a critical review (by a panel of interested parties, ISO/TS 14071) of a comparative assertion intended to be disclosed to the public. These routes are listed side by side for screening; a statement that one is better than another needs that review. None of these routes has had such a review.