All articles starting with a number or symbol
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2-Hexanone
2-Hexanone, also known as methyl n-butyl ketone or MBK, is a colorless, acetone-like ketone formerly used as a solvent and abandoned for causing peripheral neuropathy.
2-Hexenal
2-Hexenal, also known as leaf aldehyde or trans-2-hexenal, is a six-carbon unsaturated aldehyde that gives freshly cut green plants their sharp scent, used as a flavoring and fragrance.
2-Hydroxyethyl methacrylate
2-Hydroxyethyl methacrylate (HEMA) is a hydrophilic methacrylate monomer whose water-swollen polymer, PHEMA, is the hydrogel used in soft contact lenses, dental adhesives, and drug delivery.
2-Hydroxypropyl-β-cyclodextrin
2-Hydroxypropyl-β-cyclodextrin (HP-β-CD; pharmacopeial name hydroxypropylbetadex) is a modified β-cyclodextrin whose hydroxypropyl groups make it highly water soluble, used as a pharmaceutical excipient and investigated intravenously for Niemann-Pick disease type C1.
2-Imidazoline
2-Imidazoline (4,5-dihydro-1H-imidazole) is a strongly basic five-membered heterocycle with two nitrogen atoms, used as a medicinal chemistry scaffold, a ligand in catalysis, and the head group of fatty corrosion inhibitors.
2-inch quadruplex videotape
2-inch quadruplex videotape, also called 2-inch quad, is an open-reel analog video format introduced by Ampex in 1956, the first practical videotape format and broadcast standard.
2-Mercaptoethanol
2-Mercaptoethanol (β-mercaptoethanol, BME, or thioglycol; HSCH2CH2OH) is a clear, foul-smelling organosulfur liquid used chiefly to reduce disulfide bonds in proteins, notably in SDS-PAGE buffers, and to support lymphocyte growth in cell culture.
2-meter band
The 2-meter band is an amateur radio band in the VHF spectrum, spanning 144 to 148 MHz in the Americas and 144 to 146 MHz elsewhere.
2-Methoxybenzaldehyde
2-Methoxybenzaldehyde, also known as o-anisaldehyde, is an aromatic aldehyde with a methoxy group ortho to the formyl group on benzene, used as a flavoring and fragrance ingredient and in organic synthesis.
2-Methoxyestradiol
2-Methoxyestradiol (2ME2, also called 2-ME or Panzem) is an endogenous metabolite of estradiol with antiangiogenic, antimitotic, and proapoptotic activity, developed as an investigational anticancer drug.
2-Methoxyethanol
2-Methoxyethanol, also called ethylene glycol monomethyl ether, is a glycol ether solvent used in paints, coatings, and printing inks and classified as a reproductive and developmental toxicant.
2-Methoxynaphthalene
2-Methoxynaphthalene, known commercially as Nerolin Yara Yara or yara yara, is the methyl ether of 2-naphthol, used as a sweet orange-blossom fragrance material and as an intermediate in the synthesis of naproxen.
2-Methyl-2,4-pentanediol
2-Methyl-2,4-pentanediol, also called hexylene glycol or MPD, is a colorless, water-miscible six-carbon diol with formula C6H14O2, used as a solvent, chemical intermediate, and widely used precipitant in protein crystallography.
2-Methylbutanal
2-Methylbutanal, also known as 2-methylbutyraldehyde, is a volatile branched-chain aldehyde, C₅H₁₀O, with a malty odor that forms in foods through Strecker degradation during heating and fermentation and is used as a flavor agent.
2-Methylfuran
2-Methylfuran is a clear, colorless furan derivative made by hydrogenating furfural from biomass, used in pharmaceutical and pesticide synthesis, and studied as a second-generation biofuel.
2-Methylpentane
2-Methylpentane, also called isohexane, is a branched-chain alkane with formula C₆H₁₄, one of the five structural isomers of hexane, a colorless, highly flammable liquid boiling at 60 °C.
2-Methyltetrahydrofuran
2-Methyltetrahydrofuran (2-MeTHF), also called 2-methyloxolane, is a renewable cyclic ether solvent produced from furfural in biomass, used as a greener alternative to THF and hexane, and permitted for food extraction in the EU since 2023.
2-Naphthol
2-Naphthol, also called β-naphthol or 2-hydroxynaphthalene, is an aromatic organic compound with formula C₁₀H₈O, a white crystalline solid produced by the thousands of tonnes yearly chiefly for azo dyes and dye intermediates.
2-Naphthylamine
2-Naphthylamine, also known as beta-naphthylamine, is an aromatic amine classified by IARC as carcinogenic to humans, causing bladder cancer and banned commercially since the mid-twentieth century.
2-Nitroaniline
2-Nitroaniline, also called o-nitroaniline, is an orange solid organic compound with an amino and nitro group on adjacent carbons, used mainly in dye and pigment manufacture.
2-Nitrobenzaldehyde
2-Nitrobenzaldehyde, also called o-nitrobenzaldehyde, is an organic compound with a nitro group adjacent to the formyl group on a benzaldehyde ring, produced in multi-ton quantities as a pharmaceutical intermediate for drugs such as nifedipine.
2-Nitrodiphenylamine
2-Nitrodiphenylamine (2-NDPA), also called 2-nitro-N-phenylaniline or Sudan Yellow 1339, is a nitroaromatic compound used as a propellant stabilizer, notably in the U.S. Navy's Otto Fuel II, and as a solvent dye.
2-Nitropropane
2-Nitropropane, also called dimethylnitromethane, is a colorless, fruity-smelling nitroalkane used mainly as a solvent for inks, paints, adhesives, and coatings, and is a possible human carcinogen.
2-Nonenal
2-Nonenal is an unsaturated nine-carbon aldehyde whose trans isomer causes the cardboard off-flavor of stale beer, occurs in foods like coffee and cucumbers, and underlies age-related body odor.
2-opt
2-opt is a local search move for the traveling salesman problem that deletes two edges of a tour and reconnects the paths the other way, shortening the tour.
2-Oxazolidone
2-Oxazolidone, also known as 2-oxazolidinone or oxazolidin-2-one, is a five-membered cyclic carbamate with the formula C3H5NO2, important in asymmetric synthesis through Evans chiral auxiliaries and as the core of antibiotics including linezolid.
2-Phenylethanol
2-Phenylethanol, also called phenethyl alcohol, is an aromatic primary alcohol with a rose-like odor and the major component of rose water, produced mostly by chemical synthesis for use in perfumes, cosmetics, and foods.
2-Pyrrolidone
2-Pyrrolidone, or pyrrolidin-2-one, is a five-membered cyclic amide, or lactam, with formula C₄H₇NO, used industrially as a high-boiling polar solvent and as a precursor to N-vinylpyrrolidone and Nylon-4.
2-satisfiability
2-satisfiability (2-SAT) is the problem of deciding whether a Boolean formula whose clauses each contain exactly two literals has a satisfying truth assignment, solvable in linear time.
2-vinyl bacteriochlorophyllide hydratase
2-vinyl bacteriochlorophyllide hydratase (BchF, EC 4.2.1.165) is a bacterial enzyme that hydrates the C3-vinyl group of chlorophyllide a to a 1-hydroxyethyl group in bacteriochlorophyll a biosynthesis; its paralogue BchV serves bacteriochlorophyll c.