Physical world and mathematics

Ethyl levulinate

Ethyl levulinate (ethyl 4-oxopentanoate) is the ethyl ester of levulinic acid, a bio-based compound studied mainly as a diesel oxygenate additive and also used as a flavoring, fragrance, and green solvent.

Ethyl methyl carbonate

Ethyl methyl carbonate (EMC) is the simplest asymmetric organic carbonate, with properties between dimethyl and diethyl carbonate, used as a co-solvent in lithium-ion battery electrolytes and a gasoline octane enhancer.

Ethyl propionate

Ethyl propionate (ethyl propanoate) is the ester of ethanol and propionic acid, a colorless liquid with a strong pineapple- and rum-like odor used as a flavoring agent and solvent.

Ethyl vinyl ether

Ethyl vinyl ether (ethoxyethene) is a clear, low-boiling flammable liquid used industrially as a cationic polymerization monomer and in the laboratory to protect alcohols as acetal groups.

Ethylamine

Ethylamine, also known as ethanamine or aminoethane, is a two-carbon primary aliphatic amine (CH3CH2NH2), a colorless gas or liquid boiling at 16.6 °C and miscible with water, used chiefly to make triazine herbicides.

Ethylbenzene

Ethylbenzene (C8H10) is a colorless, flammable aromatic hydrocarbon with a gasoline-like odor, produced by alkylating benzene with ethylene and used almost entirely to make styrene.

Ethylene

Ethylene (ethene) is the simplest alkene, a colorless, flammable gas serving as the world's highest-volume chemical feedstock and as the plant hormone that ripens fruit.

Ethylene carbonate

Ethylene carbonate, also known as dioxolanone, is a colorless solid cyclic carbonate ester that serves as the key solvent in nearly all commercial lithium-ion battery electrolytes.

Ethylene dimerization

Ethylene dimerization is the catalytic joining of two ethylene molecules to form 1-butene, the on-purpose industrial route to a comonomer for linear low-density polyethylene, catalyzed mainly by isolated ionic nickel sites.

Ethylene glycol

Ethylene glycol, also known as monoethylene glycol or ethane-1,2-diol, is a syrupy liquid made on a huge scale as antifreeze and as the precursor of PET polyester, and is highly toxic if swallowed.

Ethylene glycol dimethacrylate

Ethylene glycol dimethacrylate (EGDMA) is the diester of ethylene glycol and methacrylic acid, a difunctional monomer used as a crosslinker in dental resins and hydrogels.

Ethylene glycol poisoning

Ethylene glycol poisoning, also called antifreeze poisoning, is toxic injury from swallowing ethylene glycol, the sweet-tasting liquid in antifreeze, which causes metabolic acidosis and acute kidney injury.

Ethylene oxide

Ethylene oxide, also known as oxirane or epoxyethane, is a colorless, flammable gas used mainly as a chemical intermediate and as a sterilant for medical devices.

Ethylene-vinyl acetate

Ethylene-vinyl acetate (EVA) is a copolymer of ethylene and vinyl acetate, best known as the foam in shoe midsoles and the encapsulant in solar modules.

Ethylenediamine

Ethylenediamine (ethane-1,2-diamine) is the simplest ethylene diamine, a colorless, corrosive liquid best known as a chelating ligand and as the building block for EDTA and epoxy curing agents.

Ethylenediaminetetraacetic acid

Ethylenediaminetetraacetic acid (EDTA), also called edetic acid, is a synthetic aminopolycarboxylic acid that binds metal ions; first synthesized in 1935, it treats lead poisoning and serves as a food additive.

Oct 21, 2026

Ethylhexanoate

Ethylhexanoate (ethyl hexanoate, ethyl caproate), CAS 123-66-0, C8H16O2, is a JECFA-evaluated flavouring agent (FEMA 2439) with no safety concern at current intake, REACH-registered, but not approved in the EU as a fungicide active.

Ethynylbenziodoxolone reagents

Ethynylbenziodoxolone (EBX) reagents are cyclic hypervalent iodine(III) compounds, derived from 2-iodobenzoic acid and first synthesized in 1991, that transfer alkyne groups to nucleophiles and radicals in electrophilic alkynylation reactions.

Eticyclidine

Eticyclidine (PCE), also known as cyclohexamine, is a dissociative anesthetic of the arylcyclohexylamine class, an N-ethyl analog of PCP developed by Parke-Davis in the late 1950s as CI-400.

Etidronic acid

Etidronic acid, also known as etidronate (HEDP), is a first-generation bisphosphonate used as a drug for Paget's disease of bone and as an industrial water treatment chemical.

Sep 21, 2026

Etienne Brasselet

Etienne Brasselet is a French physicist and CNRS research director at LOMA near Bordeaux, known for generating optical vortices from liquid crystal droplets and winning the 2019 Prix Louis Ancel.

Étienne-Louis Malus

Étienne-Louis Malus (1775–1812) was a French engineer and physicist who discovered the polarization of light by reflection in 1808; his intensity law for polarizers is known as Malus's law.

Etiocholanolone

Etiocholanolone, also called 5-isoandrosterone or aetiocholanolone, is an androgenically inactive 17-ketosteroid and major urinary metabolite of testosterone known as a pyrogen and GABAA receptor modulator.

ETKDG

ETKDG (Experimental-Torsion basic Knowledge Distance Geometry) is a stochastic conformer generator for small organic molecules, developed by Riniker and Landrum and implemented in RDKit in 2015.

EtMe3Sb[Pd(dmit)2]2

EtMe3Sb[Pd(dmit)2]2, often called dmit-131, is an organic Mott insulator whose spins form a triangular lattice and remain unordered even near absolute zero, a leading quantum spin liquid candidate.

Etonogestrel

Etonogestrel, also known as 3-ketodesogestrel, is a synthetic progestin and the active metabolite of desogestrel, used as the active ingredient of the Nexplanon contraceptive implant and the NuvaRing vaginal ring.

Etravirine

Etravirine, formerly TMC125 and marketed as Intelence, is a second-generation non-nucleoside reverse transcriptase inhibitor of the diarylpyrimidine class used with other antiretrovirals to treat HIV-1 in treatment-experienced patients.

Etretinate

Etretinate, sold as Tegison and Tigason, is a second-generation retinoid for severe psoriasis, with an elimination half-life of about 120 days that led to its withdrawal for birth-defect risk.