{"id":6175,"date":"2026-06-06T17:25:26","date_gmt":"2026-06-06T09:25:26","guid":{"rendered":"https:\/\/mikemchem.com\/?post_type=product&p=6175"},"modified":"2026-06-06T17:29:35","modified_gmt":"2026-06-06T09:29:35","slug":"4h-cyclopenta21-b34-bdithiophen-4-one-cas-25796-77-45","status":"publish","type":"product","link":"https:\/\/mikemchem.com\/ru\/product\/4h-cyclopenta21-b34-bdithiophen-4-one-cas-25796-77-45\/","title":{"rendered":"4H-Cyclopenta[2,1-b:3,4-b\u2019]dithiophen-4-one CAS 25796-77-4"},"content":{"rendered":"

What is 4H-Cyclopenta[2,1-b:3,4-b’]dithiophen-4-one CAS 25796-77-4?<\/h3>\n

4H-Cyclopenta[2,1-b:3,4-b’]dithiophen-4-one CAS 25796-77-4 (commonly abbreviated as CPDT-one) is a rigid, coplanar, sulfur-containing fused-ring heterocyclic ketone. Appearing as an orange to amber to dark-red powder or crystalline solid, it features a central cyclopentadienone core flanked by two symmetric thiophene rings. This unique fused tricyclic framework provides extended \u03c0-electron conjugation and an electron-deficient carbonyl center. It is highly valued as an indispensable structural building block and specialty intermediate in organic electronics, molecular material design, and advanced cross-coupling chemistry.<\/p>\n

Specifications<\/h3>\n\n\n\n\n\n\n\n\n
Item<\/td>\nValue<\/td>\n<\/tr>\n
Appearance<\/td>\nOrange to amber to dark red powder to crystal<\/td>\n<\/tr>\n
Melting Point<\/td>\n134.0 to 138.0 \u00b0C<\/td>\n<\/tr>\n
Boiling Point<\/td>\n349.6\u00b117.0 \u00b0C (Predicted)<\/td>\n<\/tr>\n
Density<\/td>\n1.553 g\/cm3<\/td>\n<\/tr>\n
Storage Conditions<\/td>\nKeep in a dark place, sealed in dry, room temperature under inert atmosphere<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Features<\/h3>\n
    \n
  • Rigid \u03c0-Conjugated System:<\/b> The fused dithiophene-cyclopentadienone core provides an excellent coplanar platform that facilitates strong intermolecular \u03c0-\u03c0 stacking and efficient charge transport.<\/li>\n
  • Electron-Deficient Carbonyl Center:<\/b> The bridging carbonyl group acts as a strong electron-withdrawing handle, lowering the LUMO energy levels of the resulting molecular systems to optimize push-pull architecture.<\/li>\n
  • Highly Reactive Coupling Sites:<\/b> The \u03b1-positions of the flanking thiophene rings are highly susceptible to targeted halogenation (bromination), enabling subsequent smooth functionalization.<\/li>\n
  • Superb Synthetic Versatility:<\/b> The central ketone group offers a reliable site for nucleophilic addition, dicyanovinyl modifications, or conversion into low-bandgap polymer backbones.<\/li>\n<\/ul>\n

    Applications<\/h3>\n
      \n
    • Organic Optoelectronics & Semiconductors:<\/b> Extensively utilized as a core building block to synthesize high-performance p-type and n-type organic semiconductors, donor-acceptor (D-A) copolymers, and non-fullerene acceptors (NFAs) for organic photovoltaics (OPVs) and organic field-effect transistors (OFETs).<\/li>\n
    • Suzuki & Stille Cross-Coupling:<\/b> Widely used in palladium-catalyzed cross-coupling research, acting as a critical halogenated precursor or boronic ester derivative for expanding conjugated molecular architectures.<\/li>\n
    • Functional Material Design:<\/b> Applied in materials science labs to engineer advanced electrochromic materials, organic light-emitting diodes (OLEDs), and chemical sensors where tunable electronic properties are desired.<\/li>\n
    • Heterocyclic Chemical Synthesis:<\/b> Functions as a specialty research compound and high-purity organic scaffold for manufacturing complex condensed thienyl rings and active optoelectronic fine chemicals.<\/li>\n<\/ul>\n

      Packaging<\/h3>\n

      Mikem offers flexible packaging options, including 25 kg of fiber drums for liquid products and 15\u201325 kg PP\/PE bags for powder products, all customizable to meet your specific needs.<\/p>\n","protected":false},"excerpt":{"rendered":"

      CAS: 25796-77-4
      \nMolecular Formula: C9H4OS2
      \nMolecular Weight: 192.26
      \nEINECS: \u2013
      \nHS Code: 2934.99.9001<\/p>\n

      Synonyms: 3,4-b’]dithiophen-4-one; Cyclopenta[2,1-b; 4H-Cyclopenta-[2,1-b:3,4-b’]dithiophene-4-one; 4H-Cyclopenta[1,2-b:5,4-b’]dithiophen-4-one; Cyclopenta[2,1-b:3,4-b’]dithiophen-4-one; CPDT-one<\/p>\n","protected":false},"featured_media":6203,"template":"","meta":[],"product_brand":[],"product_cat":[20],"product_tag":[],"class_list":["post-6175","product","type-product","status-publish","has-post-thumbnail","product_cat-organic-intermediate","first","instock","shipping-taxable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/mikemchem.com\/ru\/wp-json\/wp\/v2\/product\/6175","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mikemchem.com\/ru\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/mikemchem.com\/ru\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/mikemchem.com\/ru\/wp-json\/wp\/v2\/media\/6203"}],"wp:attachment":[{"href":"https:\/\/mikemchem.com\/ru\/wp-json\/wp\/v2\/media?parent=6175"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/mikemchem.com\/ru\/wp-json\/wp\/v2\/product_brand?post=6175"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/mikemchem.com\/ru\/wp-json\/wp\/v2\/product_cat?post=6175"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/mikemchem.com\/ru\/wp-json\/wp\/v2\/product_tag?post=6175"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}